Etching is traditionally the process of using strong
acid
In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequ ...
or
mordant
A mordant or dye fixative is a substance used to set (i.e. bind) dyes on fabrics by forming a coordination complex with the dye, which then attaches to the fabric (or tissue). It may be used for dyeing fabrics or for intensifying stains in ...
to cut into the unprotected parts of a
metal
A metal (from Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typicall ...
surface to create a design in
intaglio (incised) in the metal. In modern manufacturing, other chemicals may be used on other types of material. As a method of
printmaking
Printmaking is the process of creating artworks by printing, normally on paper, but also on fabric, wood, metal, and other surfaces. "Traditional printmaking" normally covers only the process of creating prints using a hand processed techniq ...
, it is, along with
engraving
Engraving is the practice of incising a design onto a hard, usually flat surface by cutting grooves into it with a Burin (engraving), burin. The result may be a decorated object in itself, as when silver, gold, steel, or Glass engraving, glass ...
, the most important technique for
old master print
An old master print is a work of art produced by a printing process within the Western tradition. The term remains current in the art trade, and there is no easy alternative in English to distinguish the works of "fine art" produced in printmakin ...
s, and remains in wide use today. In a number of modern variants such as
microfabrication etching and
photochemical milling it is a crucial technique in much modern technology, including
circuit board
A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in Electrical engineering, electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a L ...
s.
In traditional pure etching, a metal plate (usually of copper, zinc or steel) is covered with a waxy
ground which is resistant to acid. The artist then scratches off the ground with a pointed etching needle where the artist wants a line to appear in the finished piece, exposing the bare metal. The échoppe, a tool with a slanted oval section, is also used for "swelling" lines. The plate is then dipped in a bath of acid, known as the ''
mordant
A mordant or dye fixative is a substance used to set (i.e. bind) dyes on fabrics by forming a coordination complex with the dye, which then attaches to the fabric (or tissue). It may be used for dyeing fabrics or for intensifying stains in ...
'' (
French for "biting") or ''etchant'', or has acid washed over it. The acid "bites" into the metal (it undergoes a
redox
Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate (chemistry), substrate change. Oxidation is the loss of Electron, electrons or an increase in the oxidation state, while reduction ...
reaction) to a depth depending on time and acid strength, leaving behind the drawing (as carved into the wax) on the metal plate. The remaining ground is then cleaned off the plate. For first and renewed uses the plate is inked in any chosen non-corrosive ink all over and the surface ink drained and wiped clean, leaving ink in the etched forms.
The plate is then put through a high-pressure
printing press
A printing press is a mechanical device for applying pressure to an inked surface resting upon a printing, print medium (such as paper or cloth), thereby transferring the ink. It marked a dramatic improvement on earlier printing methods in wh ...
together with a sheet of paper (often moistened to soften it). The paper picks up the ink from the etched lines, making a print. The process can be repeated many times; typically several hundred impressions (copies) could be printed before the plate shows much sign of wear. The work on the plate can be added to or repaired by re-waxing and further etching; such an etching (plate) may have been used in more than one
state
State may refer to:
Arts, entertainment, and media Literature
* ''State Magazine'', a monthly magazine published by the U.S. Department of State
* ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States
* ''Our S ...
.
Etching has often been combined with other
intaglio techniques such as
engraving
Engraving is the practice of incising a design onto a hard, usually flat surface by cutting grooves into it with a Burin (engraving), burin. The result may be a decorated object in itself, as when silver, gold, steel, or Glass engraving, glass ...
(e.g.,
Rembrandt
Rembrandt Harmenszoon van Rijn (, ; 15 July 1606 – 4 October 1669), usually simply known as Rembrandt, was a Dutch Golden Age painter, printmaker and draughtsman. An innovative and prolific master in three media, he is generally consid ...
) or
aquatint
Aquatint is an intaglio printmaking technique, a variant of etching that produces areas of tone rather than lines. For this reason it has mostly been used in conjunction with etching, to give both lines and shaded tone. It has also been used h ...
(e.g.,
Francisco Goya
Francisco José de Goya y Lucientes (; ; 30 March 174616 April 1828) was a Spanish romantic painter and printmaker. He is considered the most important Spanish artist of the late 18th and early 19th centuries. His paintings, drawings, and ...
).
History
Origin
Etching in antiquity
Etching was already used in antiquity for decorative purposes.
Etched carnelian beads
Etched carnelian beads, or sometimes bleached carnelian beads, are a type of ancient decorative beads made from carnelian with an etched design in white, which were probably manufactured by the Indus Valley civilization during the 3rd millennium BC ...
are a type of ancient decorative beads made from
carnelian
Carnelian (also spelled cornelian) is a brownish-red mineral commonly used as a semi-precious gemstone. Similar to carnelian is sard, which is generally harder and darker (the difference is not rigidly defined, and the two names are often use ...
with an etched design in white, which were probably manufactured by the
Indus Valley civilization
The Indus Valley Civilisation (IVC), also known as the Indus Civilisation was a Bronze Age civilisation in the northwestern regions of South Asia, lasting from 3300 BCE to 1300 BCE, and in its mature form 2600 BCE to 1900&n ...
during the 3rd millennium BCE. They were made according to a technique of alkaline etching developed by the
Harappa
Harappa (; Urdu/ pnb, ) is an archaeological site in Punjab, Pakistan, about west of Sahiwal. The Bronze Age Harappan civilisation, now more often called the Indus Valley Civilisation, is named after the site, which takes its name from a mode ...
ns, and vast quantities of these beads were found in the archaeological sites of the Indus Valley civilization.
[British Museum notice: "Gold and carnelians beads. The two beads etched with patterns in white were probably imported from the Indus Valley. They were made by a technique developed by the Harappan civilization" Photograph of the necklace in question] They are considered as an important marker of ancient trade between the
Indus Valley
The Indus ( ) is a transboundary river of Asia and a trans-Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in Western Tibet, flows northwest through the disputed region of Kashmir, ...
,
Mesopotamia
Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the F ...
and even
Ancient Egypt, as these precious and unique manufactured items circulated in great numbers between these geographical areas during the 3rd millennium BCE, and have been found in numerous tomb deposits.
Sumerian kings, such as
Shulgi
Shulgi ( dŠulgi, formerly read as Dungi) of Ur was the second king of the Third Dynasty of Ur. He reigned for 48 years, from c. 2094 – c. 2046 BC (Middle Chronology) or possibly c. 2030 – 1982 BC ( Short Chronology). His accomplishme ...
circa 2000 BCE, also created etched carnelian beads for dedication purposes.
Early etching
Etching by
goldsmith
A goldsmith is a Metalworking, metalworker who specializes in working with gold and other precious metals. Nowadays they mainly specialize in jewelry-making but historically, goldsmiths have also made cutlery, silverware, platter (dishware), pl ...
s and other metal-workers in order to decorate metal items such as guns, armour, cups and plates has been known in Europe since the
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
at least, and may go back to antiquity. The elaborate decoration of armour, in Germany at least, was an art probably imported from Italy around the end of the 15th century—little earlier than the birth of etching as a printmaking technique. Printmakers from the German-speaking lands and Central Europe perfected the art and transmitted their skills over the Alps and across Europe.
![BM engraved printing plates](https://upload.wikimedia.org/wikipedia/commons/b/bd/BM_engraved_printing_plates.jpg)
The process as applied to printmaking is believed to have been invented by
Daniel Hopfer Daniel Hopfer (circa 1470 in Kaufbeuren – 1536 in Augsburg) was a German artist who is widely believed to have been the first to use etching in printmaking, at the end of the fifteenth century. He also worked in woodcut. Although his etchings wer ...
(c. 1470–1536) of Augsburg, Germany. Hopfer was a craftsman who decorated armour in this way, and applied the method to printmaking, using iron plates (many of which still exist). Apart from his prints, there are two proven examples of his work on armour: a shield from 1536 now in the Real Armeria of Madrid and a sword in the
Germanisches Nationalmuseum
The Germanisches National Museum is a museum in Nuremberg, Germany. Founded in 1852, it houses a large collection of items relating to German culture and art extending from prehistoric times through to the present day. The Germanisches National ...
of Nuremberg. An Augsburg horse armour in the
German Historical Museum
The German Historical Museum (german: Deutsches Historisches Museum), known by the acronym DHM, is a museum in Berlin, Germany devoted to German history. It describes itself as a place of "enlightenment and understanding of the shared history ...
,
Berlin
Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...
, dating to between 1512 and 1515, is decorated with motifs from Hopfer's etchings and
woodcut
Woodcut is a relief printing technique in printmaking. An artist carves an image into the surface of a block of wood—typically with gouges—leaving the printing parts level with the surface while removing the non-printing parts. Areas that ...
s, but this is no evidence that Hopfer himself worked on it, as his decorative prints were largely produced as patterns for other craftsmen in various media. The oldest dated etching is by
Albrecht Dürer
Albrecht Dürer (; ; hu, Ajtósi Adalbert; 21 May 1471 – 6 April 1528),Müller, Peter O. (1993) ''Substantiv-Derivation in Den Schriften Albrecht Dürers'', Walter de Gruyter. . sometimes spelled in English as Durer (without an umlaut) or Due ...
in 1515, although he returned to engraving after six etchings instead of developing the craft.
The switch to copper plates was probably made in Italy, and thereafter etching soon came to challenge
engraving
Engraving is the practice of incising a design onto a hard, usually flat surface by cutting grooves into it with a Burin (engraving), burin. The result may be a decorated object in itself, as when silver, gold, steel, or Glass engraving, glass ...
as the most popular medium for artists in
printmaking
Printmaking is the process of creating artworks by printing, normally on paper, but also on fabric, wood, metal, and other surfaces. "Traditional printmaking" normally covers only the process of creating prints using a hand processed techniq ...
. Its great advantage was that, unlike engraving where the difficult technique for using the
burin requires special skill in metalworking, the basic technique for creating the image on the plate in etching is relatively easy to learn for an artist trained in drawing. On the other hand, the handling of the ground and acid need skill and experience, and are not without health and safety risks, as well as the risk of a ruined plate.
Callot's innovations: échoppe, hard ground, stopping-out
Jacques Callot
Jacques Callot (; – 1635) was a baroque printmaker and draftsman from the Duchy of Lorraine (an independent state on the north-eastern border of France, southwestern border of Germany and overlapping the southern Netherlands). He is an impo ...
(1592–1635) from
Nancy in
Lorraine
Lorraine , also , , ; Lorrain: ''Louréne''; Lorraine Franconian: ''Lottringe''; german: Lothringen ; lb, Loutrengen; nl, Lotharingen is a cultural and historical region in Northeastern France, now located in the administrative region of Gr ...
(now part of France) made important technical advances in etching technique.
Callot also appears to have been responsible for an improved, harder, recipe for the etching ground, using
lute
A lute ( or ) is any plucked string instrument with a neck and a deep round back enclosing a hollow cavity, usually with a sound hole or opening in the body. It may be either fretted or unfretted.
More specifically, the term "lute" can ref ...
-makers' varnish rather than a wax-based formula. This enabled lines to be more deeply bitten, prolonging the life of the plate in printing, and also greatly reducing the risk of "foul-biting", where acid gets through the ground to the plate where it is not intended to, producing spots or blotches on the image. Previously the risk of foul-biting had always been at the back of an etcher's mind, preventing too much time on a single plate that risked being ruined in the biting process. Now etchers could do the highly detailed work that was previously the monopoly of engravers, and Callot made full use of the new possibilities.
Callot also made more extensive and sophisticated use of multiple "stoppings-out" than previous etchers had done. This is the technique of letting the acid bite lightly over the whole plate, then stopping-out those parts of the work which the artist wishes to keep light in tone by covering them with ground before bathing the plate in acid again. He achieved unprecedented subtlety in effects of distance and light and shade by careful control of this process. Most of his prints were relatively small—up to about six inches or 15 cm on their longest dimension, but packed with detail.
One of his followers, the Parisian
Abraham Bosse
Abraham Bosse ( – 14 February 1676) was a French artist, mainly as a printmaker in etching, but also in watercolour.[Rembrandt
Rembrandt Harmenszoon van Rijn (, ; 15 July 1606 – 4 October 1669), usually simply known as Rembrandt, was a Dutch Golden Age painter, printmaker and draughtsman. An innovative and prolific master in three media, he is generally consid ...]
,
Giovanni Benedetto Castiglione
Giovanni Benedetto Castiglione (baptized 23 March 16095 May 1664) was an Italian Baroque painter, printmaker and draftsman, of the Genoese school. He is best known now for his etchings, and as the inventor of the printmaking technique of monoty ...
and many other masters. In the 18th century,
Piranesi
Giovanni Battista (or Giambattista) Piranesi (; also known as simply Piranesi; 4 October 1720 – 9 November 1778) was an Italian Classical archaeologist, architect, and artist, famous for his etchings of Rome and of fictitious and atmospheric ...
,
Tiepolo
Giovanni Battista Tiepolo ( , ; March 5, 1696 – March 27, 1770), also known as Giambattista (or Gianbattista) Tiepolo, was an Italian painter and printmaker from the Republic of Venice who painted in the Rococo style, considered an import ...
and
Daniel Chodowiecki
Daniel Niklaus Chodowiecki (16 October 1726 – 7 February 1801) was a German painter and printmaker of Huguenot and Polish ancestry, who is most famous as an etcher. He spent most of his life in Berlin, and became the director of the Berlin Acad ...
were the best of a smaller number of fine etchers. In the 19th and early 20th century, the
Etching revival
The etching revival was the re-emergence and invigoration of etching as an original form of printmaking during the period approximately from 1850 to 1930. The main centres were France, Britain and the United States, but other countries, such as t ...
produced a host of lesser artists, but no really major figures. Etching is still widely practiced today.
Variants
Aquatint
Aquatint is an intaglio printmaking technique, a variant of etching that produces areas of tone rather than lines. For this reason it has mostly been used in conjunction with etching, to give both lines and shaded tone. It has also been used h ...
uses acid-resistant resin to achieve tonal effects.
Soft-ground etching uses a special softer ground. The artist places a piece of paper (or cloth etc. in modern uses) over the ground and draws on it. The print resembles a drawing. Soft ground can also be used to capture the texture or pattern of fabrics or furs pressed into the soft surface.
Other materials that are not manufactured specifically for etching can be used as grounds or resists. Examples including printing ink, paint, spray paint, oil pastels, candle or bees wax, tacky vinyl or stickers, and permanent markers.
There are some new non-toxic grounds on the market that work differently than typical hard or soft grounds.
Relief etching was invented by
William Blake
William Blake (28 November 1757 – 12 August 1827) was an English poet, painter, and printmaker. Largely unrecognised during his life, Blake is now considered a seminal figure in the history of the poetry and visual art of the Romantic Age. ...
in about 1788, and he has been almost the only artist to use it in
its original form. However, from 1880 to 1950 a photo-mechanical ("line-block") variant was the dominant form of commercial printing for images. A similar process to etching, but printed as a
relief print
Relief printing is a family of printing methods where a printing block, plate or matrix, which has had ink applied to its non-recessed surface, is brought into contact with paper. The non-recessed surface will leave ink on the paper, whereas t ...
, so it is the "white" background areas which are exposed to the acid, and the areas to print "black" which are covered with ground. Blake's exact technique remains controversial. He used the technique to print texts and images together, writing the text and drawing lines with an acid-resistant medium.
Carborundum etching (sometimes called carbograph printing) was invented in the mid-20th century by American artists who worked for the
WPA
WPA may refer to:
Computing
*Wi-Fi Protected Access, a wireless encryption standard
*Windows Product Activation, in Microsoft software licensing
* Wireless Public Alerting (Alert Ready), emergency alerts over LTE in Canada
* Windows Performance An ...
.
In this technique, a metal plate is first covered with
silicon carbide
Silicon carbide (SiC), also known as carborundum (), is a hard chemical compound containing silicon and carbon. A semiconductor, it occurs in nature as the extremely rare mineral moissanite, but has been mass-produced as a powder and crystal sin ...
grit and run through an etching press; then a design is drawn on the roughened plate using an acid-resistant medium. After immersion in an acid bath, the resulting plate is printed as a relief print. The roughened surface of the relief permits considerable tonal range, and it is possible to attain a high relief that results in strongly embossed prints.
[Medley-Buckner, C. (1999). "Carborundum Mezzotint and Carborundum Etching". ''Print Quarterly'', 16 (1): 34–49.]
Printmaking technique in detail
![Tools of etching](https://upload.wikimedia.org/wikipedia/commons/c/c0/Tools_of_etching.svg)
A waxy acid-resist, known as a ground, is applied to a metal plate, most often
copper
Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...
or
zinc
Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...
but
steel
Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
plate is another medium with different qualities. There are two common types of ground: hard ground and soft ground.
Hard ground can be applied in two ways. Solid hard ground comes in a hard waxy block. To apply hard ground of this variety, the plate to be etched is placed upon a hot-plate (set at 70 °C, 158 °F), a kind of metal worktop that is heated up. The plate heats up and the ground is applied by hand, melting onto the plate as it is applied. The ground is spread over the plate as evenly as possible using a roller. Once applied the etching plate is removed from the hot-plate and allowed to cool which hardens the ground.
After the ground has hardened the artist "smokes" the plate, classically with 3 beeswax tapers, applying the flame to the plate to darken the ground and make it easier to see what parts of the plate are exposed. Smoking not only darkens the plate but adds a small amount of wax. Afterwards the artist uses a sharp tool to scratch into the ground, exposing the metal.
![America a Prophecy copy a plate 01](https://upload.wikimedia.org/wikipedia/commons/b/bb/America_a_Prophecy_copy_a_plate_01.jpg)
The second way to apply hard ground is by liquid hard ground. This comes in a can and is applied with a brush upon the plate to be etched. Exposed to air the hard ground will harden. Some printmakers use
oil/tar based
asphaltum
Asphaltite (also known as uintahite, asphaltum, gilsonite or oil sands) is a naturally occurring soluble solid hydrocarbon, a form of asphalt (or bitumen) with a relatively high melting temperature. Its large-scale production occurs in the Uintah ...
or
bitumen
Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term a ...
as hard ground, although often bitumen is used to protect steel plates from rust and copper plates from aging.
Soft ground also comes in liquid form and is allowed to dry but it does not dry hard like hard ground and is impressionable. After the soft ground has dried the printmaker may apply materials such as leaves, objects, hand prints and so on which will penetrate the soft ground and expose the plate underneath.
The ground can also be applied in a fine mist, using powdered rosin or spraypaint. This process is called aquatint, and allows for the creation of tones, shadows, and solid areas of color.
The design is then drawn (in reverse) with an etching-needle or échoppe. An "echoppe" point can be made from an ordinary tempered steel etching needle, by grinding the point back on a carborundum stone, at a 45–60 degree angle. The "echoppe" works on the same principle that makes a fountain pen's line more attractive than a ballpoint's: The slight swelling variation caused by the natural movement of the hand "warms up" the line, and although hardly noticeable in any individual line, has a very attractive overall effect on the finished plate. It can be drawn with in the same way as an ordinary needle.
The plate is then completely submerged in a solution that eats away at the exposed metal.
ferric chloride
Iron(III) chloride is the inorganic compound with the formula . Also called ferric chloride, it is a common compound of iron in the +3 oxidation state. The anhydrous compound is a crystalline solid with a melting point of 307.6 °C. The colo ...
may be used for etching copper or zinc plates, whereas
nitric acid
Nitric acid is the inorganic compound with the formula . It is a highly corrosive mineral acid. The compound is colorless, but older samples tend to be yellow cast due to decomposition into oxides of nitrogen. Most commercially available nitri ...
may be used for etching zinc or steel plates. Typical solutions are 1 part FeCl
3 to 1 part water and 1 part nitric to 3 parts water. The strength of the acid determines the speed of the etching process.
* The etching process is known as ''biting'' (see also spit-biting below).
* The waxy resist prevents the
acid
In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequ ...
from biting the parts of the plate which have been covered.
* The longer the plate remains in the acid the deeper the "bites" become.
During the etching process the printmaker uses a bird feather or similar item to wave away bubbles and detritus produced by the dissolving process, from the surface of the plate, or the plate may be periodically lifted from the acid bath. If a bubble is allowed to remain on the plate then it will stop the acid biting into the plate where the bubble touches it. Zinc produces more bubbles much more rapidly than copper and steel and some artists use this to produce interesting round bubble-like circles within their prints for a Milky Way effect.
The detritus is powdery dissolved metal that fills the etched grooves and can also block the acid from biting evenly into the exposed plate surfaces. Another way to remove detritus from a plate is to place the plate to be etched face down within the acid upon plasticine balls or marbles, although the drawback of this technique is the exposure to bubbles and the inability to remove them readily.
For aquatinting a printmaker will often use a test strip of metal about a centimetre to three centimetres wide. The strip will be dipped into the acid for a specific number of minutes or seconds. The metal strip will then be removed and the acid washed off with water. Part of the strip will be covered in ground and then the strip is redipped into the acid and the process repeated. The ground will then be removed from the strip and the strip inked up and printed. This will show the printmaker the different degrees or depths of the etch, and therefore the strength of the ink color, based upon how long the plate is left in the acid.
The plate is removed from the acid and washed over with water to remove the acid. The ground is removed with a solvent such as
turpentine
Turpentine (which is also called spirit of turpentine, oil of turpentine, terebenthene, terebinthine and (colloquially) turps) is a fluid obtained by the distillation of resin harvested from living trees, mainly pines. Mainly used as a special ...
. Turpentine is often removed from the plate using methylated spirits since turpentine is greasy and can affect the application of ink and the printing of the plate.
Spit-biting is a process whereby the printmaker will apply acid to a plate with a brush in certain areas of the plate. The plate may be aquatinted for this purpose or exposed directly to the acid. The process is known as "spit"-biting due to the use of saliva once used as a medium to dilute the acid, although gum arabic or water are now commonly used.
A piece of matte board, a plastic "card", or a wad of cloth is often used to push the ink into the incised lines. The surface is wiped clean with a piece of stiff fabric known as ''
tarlatan
The manufacture of textiles is one of the oldest of human technologies. To make textiles, the first requirement is a source of fiber from which a yarn can be made, primarily by spinning. The yarn is processed by knitting or weaving, which turns ...
'' and then wiped with
newsprint
Newsprint is a low-cost, non-archival paper consisting mainly of wood pulp and most commonly used to print newspapers and other publications and advertising material. Invented in 1844 by Charles Fenerty of Nova Scotia, Canada, it usually has an ...
paper; some printmakers prefer to use the blade part of their hand or palm at the base of their thumb. The wiping leaves ink in the incisions. You may also use a folded piece of organza silk to do the final wipe. If copper or zinc plates are used, then the plate surface is left very clean and therefore white in the print. If steel plate is used, then the plate's natural tooth gives the print a grey background similar to the effects of aquatinting. As a result, steel plates do not need aquatinting as gradual exposure of the plate via successive dips into acid will produce the same result.
![Allan Osterlind Flamencotänzerin](https://upload.wikimedia.org/wikipedia/commons/4/43/Allan_Osterlind_Flamencot%C3%A4nzerin.jpg)
A damp piece of paper is placed over the plate and it is run through the press.
Nontoxic etching
Growing concerns about the health effects of acids and solvents led to the development of less toxic etching methods in the late 20th century. An early innovation was the use of floor wax as a hard ground for coating the plate. Others, such as printmakers Mark Zaffron and Keith Howard, developed systems using
acrylic polymers as a ground and
ferric chloride
Iron(III) chloride is the inorganic compound with the formula . Also called ferric chloride, it is a common compound of iron in the +3 oxidation state. The anhydrous compound is a crystalline solid with a melting point of 307.6 °C. The colo ...
for etching. The polymers are removed with
sodium carbonate
Sodium carbonate, , (also known as washing soda, soda ash and soda crystals) is the inorganic compound with the formula Na2CO3 and its various hydrates. All forms are white, odourless, water-soluble salts that yield moderately alkaline solutions ...
(washing soda) solution, rather than solvents. When used for etching, ferric chloride does not produce a corrosive gas, as acids do, thus eliminating another danger of traditional etching.
The traditional aquatint, which uses either powdered rosin or enamel spray paint, is replaced with an airbrush application of the acrylic polymer hard ground. Again, no solvents are needed beyond the soda ash solution, though a ventilation hood is needed due to acrylic particulates from the air brush spray.
The traditional soft ground, requiring solvents for removal from the plate, is replaced with water-based relief printing ink. The ink receives impressions like traditional soft ground, resists the ferric chloride etchant, yet can be cleaned up with warm water and either soda ash solution or ammonia.
Anodic etching has been used in industrial processes for over a century. The etching power is a source of direct current. The item to be etched (anode) is connected to its positive pole. A receiver plate (cathode) is connected to its negative pole. Both, spaced slightly apart, are immersed in a suitable aqueous solution of a suitable electrolyte. The current pushes the metal out from the anode into solution and deposits it as metal on the cathode. Shortly before 1990, two groups working independently developed different ways of applying it to creating intaglio printing plates.
In the patented Electroetch system, invented by Marion and Omri Behr, in contrast to certain nontoxic etching methods, an etched plate can be reworked as often as the artist desires The system uses voltages below 2 volts which exposes the uneven metal crystals in the etched areas resulting in superior ink retention and printed image appearance of quality equivalent to traditional acid methods. With polarity reversed the low voltage provides a simpler method of making mezzotint plates as well as the "steel facing" copper plates.
Some of the earliest printmaking workshops experimenting with, developing and promoting nontoxic techniques include Grafisk Eksperimentarium, in Copenhagen, Denmark, Edinburgh Printmakers, in Scotland, and
New Grounds Print Workshop
New Grounds Print Workshop, founded in 1996 by Regina Held, is a nontoxic printmaking facility specializing in intaglio and relief printmaking. It is located in Albuquerque, New Mexico, United States. According to the mission statement on t ...
, in Albuquerque, New Mexico.
Photo-etching
Light sensitive polymer plates allow for photorealistic etchings. A photo-sensitive coating is applied to the plate by either the plate supplier or the artist. Light is projected onto the plate as a negative image to expose it. Photopolymer plates are either washed in hot water or under other chemicals according to the plate manufacturers' instructions. Areas of the photo-etch image may be stopped-out before etching to exclude them from the final image on the plate, or removed or lightened by scraping and burnishing once the plate has been etched. Once the photo-etching process is complete, the plate can be worked further as a normal intaglio plate, using
drypoint
Drypoint is a printmaking technique of the intaglio (printmaking), intaglio family, in which an image is incised into a plate (or "matrix") with a hard-pointed "needle" of sharp metal or diamond point. In principle, the method is practically ident ...
, further etching, engraving, etc. The final result is an intaglio plate which is printed like any other.
Types of metal plates
Copper
Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...
is a traditional metal, and is still preferred, for etching, as it bites evenly, holds texture well, and does not distort the color of the ink when wiped.
Zinc
Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...
is cheaper than copper, so preferable for beginners, but it does not bite as cleanly as copper does, and it alters some colors of ink.
Steel
Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
is growing in popularity as an etching substrate. Increases in the prices of copper and zinc have steered steel to an acceptable alternative. The line quality of steel is less fine than copper, but finer than zinc. Steel has a natural and rich aquatint.
The type of metal used for the plate impacts the number of prints the plate will produce. The firm pressure of the printing press slowly rubs out the finer details of the image with every pass-through. With relatively soft copper, for example, the etching details will begin to wear very quickly, some copper plates show extreme wear after only ten prints. Steel, on the other hand, is incredibly durable. This wearing out of the image over time is one of the reasons etched prints created early in a numbered series tend to be valued more highly. An artist thus takes the total number of prints he or she wishes to produce into account whenever choosing the metal.
Industrial uses
Etching is also used in the manufacturing of
printed circuit board
A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in Electrical engineering, electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a L ...
s and
semiconductor device
A semiconductor device is an electronic component that relies on the electronic properties of a semiconductor material (primarily silicon, germanium, and gallium arsenide, as well as organic semiconductors) for its function. Its conductivity li ...
s, and in the preparation of metallic specimens for microscopic observation.
Prior to 1100 AD, the New World
Hohokam
Hohokam () was a culture in the North American Southwest in what is now part of Arizona, United States, and Sonora, Mexico. It existed between 300 and 1500 AD, with cultural precursors possibly as early as 300 BC. Archaeologists disagree about ...
culture independently utilized the technique of acid etching in marine shell designs. The shells were daubed in pitch and then bathed in acid probably made from fermented cactus juice.
Controlling the acid's effects
There are many ways for the printmaker to control the acid's effects.
Hard grounds
Most typically, the surface of the plate is covered in a hard,
wax
Waxes are a diverse class of organic compounds that are lipophilic, malleable solids near ambient temperatures. They include higher alkanes and lipids, typically with melting points above about 40 °C (104 °F), melting to giv ...
y 'ground' that resists acid. The printmaker then scratches through the ground with a sharp point, exposing lines of metal which the mordant acid attacks.
Aquatint
Aquatint
Aquatint is an intaglio printmaking technique, a variant of etching that produces areas of tone rather than lines. For this reason it has mostly been used in conjunction with etching, to give both lines and shaded tone. It has also been used h ...
is a variation giving only tone rather than lines when printed. Particulate resin is evenly distributed on all or parts of the plate, then heated to form a screen ground of uniform, but less than perfect, density. After etching, any exposed surface will result in a roughened (i.e., darkened) surface. Areas that are to be light in the final print are protected by varnishing between acid baths. Successive turns of varnishing and placing the plate in acid create areas of tone difficult or impossible to achieve by drawing through a wax ground.
Sugar lift
Designs in a syrupy solution of sugar or
Camp Coffee
Camp Coffee is a concentrated syrup which is flavoured with coffee and chicory, first produced in 1876 by Paterson & Sons Ltd, in Glasgow.
In 1974, Dennis Jenks merged his business with Paterson to form Paterson Jenks plc. In 1984, Paterson Je ...
are painted onto the metal surface prior to it being coated in a liquid etching ground or 'stop out' varnish. When the plate is placed in hot water the sugar dissolves, leaving the image. The plate can then be etched.
Spit bite
A mixture of nitric acid and
Gum Arabic
Gum arabic, also known as gum sudani, acacia gum, Arabic gum, gum acacia, acacia, Senegal gum, Indian gum, and by other names, is a natural gum originally consisting of the hardened sap of two species of the '' Acacia'' tree, ''Senegalia sen ...
(or, almost never, saliva) which can be dripped, spattered or painted onto a metal surface giving interesting results. A mixture of nitric acid and
rosin
Rosin (), also called colophony or Greek pitch ( la, links=no, pix graeca), is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene comp ...
may also be used.
Printing
![Cylinder press at SCAD-Lacoste in Vaucluse, France](https://upload.wikimedia.org/wikipedia/commons/4/49/Cylinder_press_at_SCAD-Lacoste_in_Vaucluse%2C_France.jpg)
Printing the plate is done by covering the surface with
printing ink
Ink is a gel, sol, or solution that contains at least one colorant, such as a dye or pigment, and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, reed pen, or quill. Thicke ...
, then rubbing the ink off the surface with ''
tarlatan
The manufacture of textiles is one of the oldest of human technologies. To make textiles, the first requirement is a source of fiber from which a yarn can be made, primarily by spinning. The yarn is processed by knitting or weaving, which turns ...
'' cloth or newsprint, leaving ink in the roughened areas and lines. Damp paper is placed on the plate, and both are run through a
printing press
A printing press is a mechanical device for applying pressure to an inked surface resting upon a printing, print medium (such as paper or cloth), thereby transferring the ink. It marked a dramatic improvement on earlier printing methods in wh ...
; the pressure forces the paper into contact with the ink, transferring the image (''c.f.'',
chine-collé). Unfortunately, the pressure subtly degrades the image in the plate, smoothing the roughened areas and closing the lines; a
copper
Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...
plate is good for, at most, a few hundred printings of a strongly etched imaged before the degradation is considered too great by the artist. At that point, the artist can manually restore the plate by re-etching it, essentially putting ground back on and retracing their lines; alternatively, plates can be
electro-plated before printing with a harder metal to preserve the surface.
Zinc
Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...
is also used, because as a softer metal, etching times are shorter; however, that softness also leads to faster degradation of the image in the press.
Faults
![Foul Bite through Soft Ground on Zinc](https://upload.wikimedia.org/wikipedia/commons/8/81/Foul_Bite_through_Soft_Ground_on_Zinc.jpg)
''Foul-bite'' or "over-biting" is common in etching, and is the effect of minuscule amounts of acid leaking through the ground to create minor pitting and burning on the surface. This incidental roughening may be removed by smoothing and polishing the surface, but artists often leave faux-bite, or deliberately court it by handling the plate roughly, because it is viewed as a desirable mark of the process.
"Etchings" euphemism
The phrase "Want to come up and see my etchings?" is a romantic euphemism by which a person entices someone to come back to their place with an offer to look at something artistic, but with ulterior motives. The phrase is a corruption of some phrases in a novel by
Horatio Alger Jr. called ''The Erie Train Boy'', which was first published in 1891. Alger was an immensely popular author in the 19th century—especially with young people—and his books were widely quoted. In chapter XXII of the book, a woman writes to her boyfriend, "I have a new collection of etchings that I want to show you. Won't you name an evening when you will call, as I want to be certain to be at home when you really do come." The boyfriend then writes back "I shall no doubt find pleasure in examining the etchings which you hold out as an inducement to call."
This was referenced in a 1929
James Thurber
James Grover Thurber (December 8, 1894 – November 2, 1961) was an American cartoonist, writer, humorist, journalist and playwright. He was best known for his cartoons and short stories, published mainly in ''The New Yorker'' and collected in ...
cartoon in which a man tells a woman in a building lobby: "You wait here and I'll bring the etchings down". It was also referenced in
Dashiell Hammett
Samuel Dashiell Hammett (; May 27, 1894 – January 10, 1961) was an American writer of hard-boiled detective novels and short stories. He was also a screenwriter and political activist. Among the enduring characters he created are Sam Spade ('' ...
's 1934 novel ''
The Thin Man
''The Thin Man'' (1934) is a detective novel by Dashiell Hammett, originally published in a condensed version in the December 1933 issue of ''Redbook''. It appeared in book form the following month. A film series followed, featuring the main cha ...
'', in which the narrator answers his wife asking him about a lady he had wandered off with by saying: "She just wanted to show me some French etchings."
The phrase was given new popularity in 1937: in a well publicized case, violinist
David Rubinoff
David Rubinoff, also known as Dave Rubinoff (September 3, 1897, Grodno, Russian Empire, now Belarus – October 6, 1986), was a popular violinist who was heard during the 1930s and 1940s on various radio programs playing his $100,000 Stradivari ...
was accused of inviting a young woman to his hotel room to view some French etchings, but instead seducing her.
As early as 1895,
Hjalmar Söderberg
Hjalmar Emil Fredrik Söderberg (2 July 1869 – 14 October 1941) was a Swedish novelist, short story writer, playwright and journalist. His works often deal with melancholy and lovelorn characters, and offer a rich portrayal of contemporary Sto ...
used the reference in his "
decadent
The word decadence, which at first meant simply "decline" in an abstract sense, is now most often used to refer to a perceived decay in standards, morals, dignity, religious faith, honor, discipline, or skill at governing among the members of ...
"
début novel
A debut novel is the first novel a novelist publishes. Debut novels are often the author's first opportunity to make an impact on the publishing industry, and thus the success or failure of a debut novel can affect the ability of the author to pu ...
''Delusions'' (swe: ''Förvillelser)'', when he lets the dandy Johannes Hall lure the main character's younger sister Greta into his room under the pretence that they browse through his etchings and engravings (e.g., ''
Die Sünde'' by
Franz Stuck
Franz von Stuck (February 23, 1863 – August 30, 1928), born Franz Stuck, was a German painter, sculptor, printmaker, and architect. Stuck was best known for his paintings of ancient mythology, receiving substantial critical acclaim with '' The ...
).
[Förvillelser, Lind & Co., 2012, p. 158—163]
See also
*
Acid test (gold)
An acid test is any qualitative chemical or metallurgical assay which uses acid; most commonly, and historically, the use of a strong acid to distinguish gold from base metals. Figuratively, acid test is any definitive test for some attribute, e.g ...
*
Electroetching
*
List of art techniques
A ''list'' is any set of items in a row. List or lists may also refer to:
People
* List (surname)
Organizations
* List College, an undergraduate division of the Jewish Theological Seminary of America
* SC Germania List, German rugby union ...
*
List of printmakers
Key to Techniques: En = Engraver (includes Drypoint), Et = Etcher, Wo = Mezzotint, Mo = Monotype, Aq = Aquatint, Li = Lithography, We = Wood engraving, Sc = Screen-printing, St = Stipple, Di = digital.
Old master print period – c. 18 ...
*
Old master prints
An old master print is a work of art produced by a printing process within the Western tradition. The term remains current in the art trade, and there is no easy alternative in English to distinguish the works of "fine art" produced in printmak ...
for the history of the method
*
Photolithography
In integrated circuit manufacturing, photolithography or optical lithography is a general term used for techniques that use light to produce minutely patterned thin films of suitable materials over a substrate, such as a silicon wafer, to protect ...
References
External links
Prints & People: A Social History of Printed Pictures an exhibition catalog from The Metropolitan Museum of Art, which contains material on etching
Metropolitan Museum, materials-and-techniques: etching*
ttp://link.library.utoronto.ca/hollar/ The Wenceslaus Hollar Collection of digitized books and images at the University of Toronto
{{Authority control
Printmaking
Relief printing
Metalworking
Chemical processes