![Isatis tinctoria MHNT](https://upload.wikimedia.org/wikipedia/commons/4/4c/Isatis_tinctoria_MHNT.BOT.2011.3.12.jpg)
''Isatis tinctoria'', also called woad (), dyer's woad, or glastum, is a
flowering plant
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...
in the family
Brassicaceae
Brassicaceae () or (the older) Cruciferae () is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous plants, while some are shrubs. The le ...
(the mustard family) with a documented history of use as a blue dye and medicinal plant. Its genus name, Isatis, derives from the ancient Greek word for the plant, ἰσάτις. It is occasionally known as Asp of Jerusalem. Woad is also the name of a blue
dye
A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution an ...
produced from the leaves of the plant. Woad is native to the
steppe
In physical geography, a steppe () is an ecoregion characterized by grassland plains without trees apart from those near rivers and lakes.
Steppe biomes may include:
* the montane grasslands and shrublands biome
* the temperate grasslands, ...
and desert zones of the
Caucasus
The Caucasus () or Caucasia (), is a region between the Black Sea and the Caspian Sea, mainly comprising Armenia, Azerbaijan, Georgia, and parts of Southern Russia. The Caucasus Mountains, including the Greater Caucasus range, have historically ...
, Central Asia to Eastern
Siberia
Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a part of ...
and
Western Asia
Western Asia, West Asia, or Southwest Asia, is the westernmost subregion of the larger geographical region of Asia, as defined by some academics, UN bodies and other institutions. It is almost entirely a part of the Middle East, and includes Ana ...
but is now also found in South-Eastern and Central
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...
and western
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...
.
Since ancient times, woad was an important source of blue dye and was cultivated throughout Europe, especially in Western and Southern Europe. In medieval times, there were important woad-growing regions in England, Germany and France. Towns such as
Toulouse
Toulouse ( , ; oc, Tolosa ) is the prefecture of the French department of Haute-Garonne and of the larger region of Occitania. The city is on the banks of the River Garonne, from the Mediterranean Sea, from the Atlantic Ocean and from Par ...
became prosperous from the woad trade. Woad was eventually replaced by the more colourfast ''
Indigofera tinctoria
''Indigofera tinctoria'', also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye.
Description
True indigo is a shrub one to two meters high. It may be an annual plant, annual, bi ...
'' and, in the early 20th century, both woad and ''Indigofera tinctoria'' were replaced by synthetic blue dyes. Woad has been used medicinally for centuries. The double use of woad is seen in its name: the term "''Isatis''" is linked to its ancient use to treat wounds; the term "''tinctoria''" references its use as a dye. There has also been some revival of the use of woad for craft purposes.
History of woad cultivation
Ancient use
The first archaeological finds of woad seeds date to the
Neolithic
The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts ...
period. The seeds have been found in the cave of l'Audoste,
Bouches-du-Rhône
Bouches-du-Rhône ( , , ; oc, Bocas de Ròse ; "Mouths of the Rhône") is a department in Southern France. It borders Vaucluse to the north, Gard to the west and Var to the east. The Mediterranean Sea lies to the south. Its prefecture and large ...
, France. Impressions of seeds of ''Färberwaid'' (Isatis tinctoria L.) or German indigo, of the plant family ''Brassicaceae'', have been found on pottery in the
Iron Age
The Iron Age is the final epoch of the three-age division of the prehistory and protohistory of humanity. It was preceded by the Stone Age (Paleolithic, Mesolithic, Neolithic) and the Bronze Age (Chalcolithic). The concept has been mostly appl ...
settlement of
Heuneburg
The Heuneburg is a prehistoric hillfort by the river Danube in Hundersingen near Herbertingen, between Ulm and Sigmaringen, Baden-Württemberg, in the south of Germany, close to the modern borders with Switzerland and Austria. It is considered to ...
, Germany. Seed and pod fragments have also been found in an Iron Age pit at Dragonby, North Lincolnshire, United Kingdom.
The
Hallstatt
Hallstatt ( , , ) is a small town in the district of Gmunden, in the Austrian state of Upper Austria. Situated between the southwestern shore of Hallstätter See and the steep slopes of the Dachstein massif, the town lies in the Salzkammergut ...
burials of the
Hochdorf Chieftain's Grave
The Hochdorf Chieftain's Grave is a richly-furnished Celtic burial chamber near Hochdorf an der Enz (municipality of Eberdingen) in Baden-Württemberg, Germany, dating from 530 BC in the Hallstatt culture period. It was discovered in 1968 by an ...
and
Hohmichele
The Heuneburg is a prehistoric hillfort by the river Danube in Hundersingen near Herbertingen, between Ulm and Sigmaringen, Baden-Württemberg, in the south of Germany, close to the modern borders with Switzerland and Austria. It is considered to ...
contained textiles dyed with woad.
Melo and Rondão write that woad was known "as far back as the time of the ancient Egyptians, who used it to dye the cloth wrappings applied for the mummies." Skelton informs us that one of the early dyes discovered by the ancient Egyptians was "blue woad (Isatis tinctoria)." Lucas writes, "What has been assumed to have been Indian Indigo on ancient Egyptian fabrics may have been woad." Hall states that the ancient Egyptians created their blue dye "by using indigotin, otherwise known as woad."
A dye known as in
Aramaic
The Aramaic languages, short Aramaic ( syc, ܐܪܡܝܐ, Arāmāyā; oar, 𐤀𐤓𐤌𐤉𐤀; arc, 𐡀𐡓𐡌𐡉𐡀; tmr, אֲרָמִית), are a language family containing many varieties (languages and dialects) that originated in ...
is mentioned in the Babylonian
Talmud
The Talmud (; he, , Talmūḏ) is the central text of Rabbinic Judaism and the primary source of Jewish religious law (''halakha'') and Jewish theology. Until the advent of modernity, in nearly all Jewish communities, the Talmud was the cente ...
.
Celtic blue is a shade of blue, also known as in
Welsh
Welsh may refer to:
Related to Wales
* Welsh, referring or related to Wales
* Welsh language, a Brittonic Celtic language spoken in Wales
* Welsh people
People
* Welsh (surname)
* Sometimes used as a synonym for the ancient Britons (Celtic peop ...
, or in both the
Irish language
Irish ( Standard Irish: ), also known as Gaelic, is a Goidelic language of the Insular Celtic branch of the Celtic language family, which is a part of the Indo-European language family. Irish is indigenous to the island of Ireland and was ...
and in
Scottish Gaelic
Scottish Gaelic ( gd, Gàidhlig ), also known as Scots Gaelic and Gaelic, is a Goidelic language (in the Celtic branch of the Indo-European language family) native to the Gaels of Scotland. As a Goidelic language, Scottish Gaelic, as well as ...
. Julius Caesar reported (in ''
Commentarii de Bello Gallico
''Commentarii de Bello Gallico'' (; en, Commentaries on the Gallic War, italic=yes), also ''Bellum Gallicum'' ( en, Gallic War, italic=yes), is Julius Caesar's firsthand account of the Gallic Wars, written as a third-person narrative. In it Ca ...
'') that the Britanni used to colour their bodies blue with , a word that means primarily "glass", but also the domestic name for the "
woad
''Isatis tinctoria'', also called woad (), dyer's woad, or glastum, is a flowering plant in the family Brassicaceae (the mustard family) with a documented history of use as a blue dye and medicinal plant. Its genus name, Isatis, derives from ...
" (''Isatis tinctoria''), besides the
Gaulish
Gaulish was an ancient Celtic languages, Celtic language spoken in parts of Continental Europe before and during the period of the Roman Empire. In the narrow sense, Gaulish was the language of the Celts of Gaul (now France, Luxembourg, Belgium ...
loanword (from
Proto-Celtic
Proto-Celtic, or Common Celtic, is the ancestral proto-language of all known Celtic languages, and a descendant of Proto-Indo-European. It is not attested in writing but has been partly Linguistic reconstruction, reconstructed through the compar ...
). The connection seems to be that both glass and the woad are "water-like" ( la, vitrum is from
Proto-Indo-European
Proto-Indo-European (PIE) is the reconstructed common ancestor of the Indo-European language family. Its proposed features have been derived by linguistic reconstruction from documented Indo-European languages. No direct record of Proto-Indo-E ...
). In terms of usage, Latin is more often used to refer to glass rather than woad.
The use of the word for the woad might also be understood as "coloured like glass", applied to the plant and the dye made from it.
Due to this and other Roman accounts of them painting (or possibly tattooing) their bodies, northern inhabitants of Britain came to be known as
Picts
The Picts were a group of peoples who lived in what is now northern and eastern Scotland (north of the Firth of Forth) during Late Antiquity and the Early Middle Ages. Where they lived and what their culture was like can be inferred from ea ...
(), meaning "painted ones" in Latin. Gillian Carr conducted experiments using indigo pigment derived from woad mixed with different binders to make body paint. The resulting paints yielded colours from "grey-blue, through intense midnight blue, to black".
People with modern experiences with woad as a tattoo pigment have claimed that it does not work well, and is actually
caustic
Caustic most commonly refers to:
* Causticity, a property of various corrosive substances
** Sodium hydroxide, sometimes called ''caustic soda''
** Potassium hydroxide, sometimes called ''caustic potash''
** Calcium oxide, sometimes called ''caus ...
and causes scarring when put into the skin.
It has also been claimed that Caesar was referring to some form of
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
iron
Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in f ...
-based pigment.
Analysis done on the
Lindow Man
Lindow Man, also known as Lindow II and (in jest) as Pete Marsh, is the preserved bog body of a man discovered in a peat bog at Lindow Moss near Wilmslow in Cheshire, North West England. The remains were found on 1 August 1984 by commer ...
did return evidence of copper. The same study also noted that the earliest definite reference to the woad plant in the British Isles dates to a seed impression on an Anglo-Saxon pot. The authors theorize that vitrum could have actually referred to
copper(II) sulfate
Copper(II) sulfate, also known as copper sulphate, is an inorganic compound with the chemical formula . It forms hydrates , where ''n'' can range from 1 to 7. The pentahydrate (''n'' = 5), a bright blue crystal, is the most commonly encountered hy ...
's naturally occurring variant
chalcanthite
Chalcanthite (, ) is a richly colored blue-green water-soluble sulfate mineral . It is commonly found in the late-stage oxidation zones of copper deposits. Due to its ready solubility, chalcanthite is more common in arid regions.
Chalcanthite i ...
or to the mineral
azurite
Azurite is a soft, deep-blue copper mineral produced by weathering of copper ore deposits. During the early 19th century, it was also known as chessylite, after the Type locality (geology), type locality at Chessy, Rhône, Chessy-les-Mines near ...
. A later study concluded the amount was "not of sufficient magnitude to provide convincing evidence that the copper was deliberately applied as paint".
Woad was an important dyeing agent in much of Europe and parts of England during the medieval period. However, dye traders began to import
indigo
Indigo is a deep color close to the color wheel blue (a primary color in the RGB color space), as well as to some variants of ultramarine, based on the ancient dye of the same name. The word "indigo" comes from the Latin word ''indicum'', m ...
during the sixteenth and seventeenth centuries, which threatened to replace locally grown woad as the primary blue dye.
The translation of vitrum as woad may date to this period.
Medieval period onwards
![The hunt of the unicorn6](https://upload.wikimedia.org/wikipedia/commons/c/c0/The_hunt_of_the_unicorn6.jpg)
Woad was one of the three staples of the European dyeing industry, along with
weld (yellow) and
madder
''Rubia'' is the type genus of the Rubiaceae family of flowering plants, which also contains coffee. It contains around 80 species of perennial scrambling or climbing herbs and subshrubs native to the Old World. The genus and its best-known spe ...
(red).
Chaucer
Geoffrey Chaucer (; – 25 October 1400) was an English poet, author, and civil servant best known for '' The Canterbury Tales''. He has been called the "father of English literature", or, alternatively, the "father of English poetry". He w ...
mentions their use by the dyer ("litestere") in his poem ''The Former Age'':
![Pastel pigment cocagnes et feuilles - Muséum du pastel](https://upload.wikimedia.org/wikipedia/commons/9/9a/Pastel_pigment_cocagnes_et_feuilles_-_Mus%C3%A9um_du_pastel.jpg)
:::No mader, welde, or wood no litestere
:::Ne knew; the flees was of his former hewe;
The three colours can be seen together in tapestries such as ''
The Hunt of the Unicorn
''The Hunt of the Unicorn'' or the ''Unicorn Tapestries'' (french: La Chasse à la licorne) is a series of seven tapestries made in the South Netherlands around 1495–1505, and now in The Cloisters in New York. They were possibly designed in ...
'' (1495–1505), though typically it is the dark blue of the woad that has lasted best. Medieval uses of the dye were not limited to textiles. For example, the illustrator of the ''
Lindisfarne Gospels
The Lindisfarne Gospels (London, British Library Cotton MS Nero D.IV) is an illuminated manuscript gospel book probably produced around the years 715–720 in the monastery at Lindisfarne, off the coast of Northumberland, which is now in the B ...
'' () used a woad-based pigment for blue paint.
In
Viking Age
The Viking Age () was the period during the Middle Ages when Norsemen known as Vikings undertook large-scale raiding, colonizing, conquest, and trading throughout Europe and reached North America. It followed the Migration Period and the Ger ...
levels at archaeological digs at
York
York is a cathedral city with Roman origins, sited at the confluence of the rivers Ouse and Foss in North Yorkshire, England. It is the historic county town of Yorkshire. The city has many historic buildings and other structures, such as a ...
, a dye shop with remains of both woad and
madder
''Rubia'' is the type genus of the Rubiaceae family of flowering plants, which also contains coffee. It contains around 80 species of perennial scrambling or climbing herbs and subshrubs native to the Old World. The genus and its best-known spe ...
have been excavated and dated to the 10th century. In medieval times, centres of woad cultivation lay in
Lincolnshire
Lincolnshire (abbreviated Lincs.) is a county in the East Midlands of England, with a long coastline on the North Sea to the east. It borders Norfolk to the south-east, Cambridgeshire to the south, Rutland to the south-west, Leicestershire ...
and
Somerset
( en, All The People of Somerset)
, locator_map =
, coordinates =
, region = South West England
, established_date = Ancient
, established_by =
, preceded_by =
, origin =
, lord_lieutenant_office =Lord Lieutenant of Somerset
, lord_ ...
in England,
Jülich
Jülich (; in old spellings also known as ''Guelich'' or ''Gülich'', nl, Gulik, french: Juliers, Ripuarian: ''Jöllesch'') is a town in the district of Düren, in the federal state of North Rhine-Westphalia, Germany. As a border region betwe ...
and the
Erfurt
Erfurt () is the capital and largest city in the Central German state of Thuringia. It is located in the wide valley of the Gera river (progression: ), in the southern part of the Thuringian Basin, north of the Thuringian Forest. It sits i ...
area in
Thuringia
Thuringia (; german: Thüringen ), officially the Free State of Thuringia ( ), is a state of central Germany, covering , the sixth smallest of the sixteen German states. It has a population of about 2.1 million.
Erfurt is the capital and larg ...
in Germany,
Piedmont
it, Piemontese
, population_note =
, population_blank1_title =
, population_blank1 =
, demographics_type1 =
, demographics1_footnotes =
, demographics1_title1 =
, demographics1_info1 =
, demographics1_title2 ...
and
Tuscany
Tuscany ( ; it, Toscana ) is a Regions of Italy, region in central Italy with an area of about and a population of about 3.8 million inhabitants. The regional capital is Florence (''Firenze'').
Tuscany is known for its landscapes, history, art ...
in Italy, and
Gascogne,
Normandy
Normandy (; french: link=no, Normandie ; nrf, Normaundie, Nouormandie ; from Old French , plural of ''Normant'', originally from the word for "northman" in several Scandinavian languages) is a geographical and cultural region in Northwestern ...
, the
Somme Basin (from
Amiens
Amiens (English: or ; ; pcd, Anmien, or ) is a city and commune in northern France, located north of Paris and south-west of Lille. It is the capital of the Somme department in the region of Hauts-de-France. In 2021, the population of ...
to
Saint-Quentin),
Brittany
Brittany (; french: link=no, Bretagne ; br, Breizh, or ; Gallo language, Gallo: ''Bertaèyn'' ) is a peninsula, Historical region, historical country and cultural area in the west of modern France, covering the western part of what was known ...
and, above all,
Languedoc
The Province of Languedoc (; , ; oc, Lengadòc ) is a former province of France.
Most of its territory is now contained in the modern-day region of Occitanie in Southern France. Its capital city was Toulouse. It had an area of approximately ...
in France. This last region, in the triangle created by
Toulouse
Toulouse ( , ; oc, Tolosa ) is the prefecture of the French department of Haute-Garonne and of the larger region of Occitania. The city is on the banks of the River Garonne, from the Mediterranean Sea, from the Atlantic Ocean and from Par ...
,
Albi
Albi (; oc, Albi ) is a commune in southern France. It is the prefecture of the Tarn department, on the river Tarn, 85 km northeast of Toulouse. Its inhabitants are called ''Albigensians'' (french: Albigeois, Albigeoise(s), oc, albig ...
, and
Carcassonne
Carcassonne (, also , , ; ; la, Carcaso) is a French fortified city in the department of Aude, in the region of Occitanie. It is the prefecture of the department.
Inhabited since the Neolithic, Carcassonne is located in the plain of the ...
known as the
Lauragais
The Lauragais () is an area of the south-west of France that is south-east of Toulouse.
The Lauragais, a former county in the south-west of France, takes its name from the town of Laurac and has a large area. It covers both sides of the Canal ...
, was for a long time the most productive of woad, or "pastel" as it was known there, one writer commenting that "woad
hath made that country the happiest and richest in Europe."
The prosperous woad merchants of
Toulouse
Toulouse ( , ; oc, Tolosa ) is the prefecture of the French department of Haute-Garonne and of the larger region of Occitania. The city is on the banks of the River Garonne, from the Mediterranean Sea, from the Atlantic Ocean and from Par ...
displayed their affluence in splendid mansions, many of which still stand, as the
Hôtel de Bernuy
The Hôtel de Bernuy in rue Léon Gambetta, Toulouse, France, is a Renaissance ''hôtel particulier'' (''palace'') of the 16th century built by the mason Louis Privat for the wealthy woad merchant, Jean de Bernuy. This townhouse is considered a m ...
and the
Hôtel d'Assézat
The Hôtel d'Assézat in Toulouse, France, is a French Renaissance ''hôtel particulier'' (urban palace) of the 16th century which houses the Bemberg Foundation, a major art gallery of the city.
The hôtel was likely built by Toulouse architect N ...
. One merchant, Jean de Bernuy, a Spanish Jew who had fled the
inquisition
The Inquisition was a group of institutions within the Catholic Church whose aim was to combat heresy, conducting trials of suspected heretics. Studies of the records have found that the overwhelming majority of sentences consisted of penances, ...
, was credit-worthy enough to be the main guarantor of the ransomed King
Francis I Francis I or Francis the First may refer to:
* Francesco I Gonzaga (1366–1407)
* Francis I, Duke of Brittany (1414–1450), reigned 1442–1450
* Francis I of France (1494–1547), King of France, reigned 1515–1547
* Francis I, Duke of Saxe-Lau ...
after his capture at the
Battle of Pavia
The Battle of Pavia, fought on the morning of 24 February 1525, was the decisive engagement of the Italian War of 1521–1526 between the Kingdom of France and the Habsburg empire of Charles V, Holy Roman Emperor as well as ruler of Spain, Au ...
by
Charles V of Spain.
Much of the woad produced here was used for the cloth industry in southern France, but it was also exported via
Bayonne
Bayonne (; eu, Baiona ; oc, label= Gascon, Baiona ; es, Bayona) is a city in Southwestern France near the Spanish border. It is a commune and one of two subprefectures in the Pyrénées-Atlantiques department, in the Nouvelle-Aquitaine re ...
,
Narbonne
Narbonne (, also , ; oc, Narbona ; la, Narbo ; Late Latin:) is a commune in France, commune in Southern France in the Occitania (administrative region), Occitanie Regions of France, region. It lies from Paris in the Aude Departments of Franc ...
and
Bordeaux
Bordeaux ( , ; Gascon oc, Bordèu ; eu, Bordele; it, Bordò; es, Burdeos) is a port city on the river Garonne in the Gironde department, Southwestern France. It is the capital of the Nouvelle-Aquitaine region, as well as the prefectur ...
to Flanders, the Low Countries, Italy, and above all Britain and Spain.
After cropping the woad eddish could be let out for grazing sheep.
The woad produced in Lincolnshire and Cambridgeshire in the 19th century was shipped out from the
Port of Wisbech
Port of Wisbech is an inland port on the River Nene in Wisbech, Isle of Ely, Cambridgeshire, United Kingdom. It is mainly used for cargo and industrial purposes, with the southern part of the port housing a number of berths for yachts. Fenland Di ...
,
Spalding and
Boston
Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...
, both the last to northern mills and the USA. The last portable woad mill was at
Parson Drove, Cambridgeshire,
Wisbech & Fenland Museum
The Wisbech & Fenland Museum, located in the town of Wisbech in the Isle of Ely, Cambridgeshire, England, is one of the oldest purpose-built museums in the United Kingdom. The museum logo is W&F.
History
Initially a member-based organisation ...
has a woad mill model, photos and other items used in woad production.
A major market for woad was at
Görlitz
Görlitz (; pl, Zgorzelec, hsb, Zhorjelc, cz, Zhořelec, :de:Ostlausitzer Mundart, East Lusatian dialect: ''Gerlz'', ''Gerltz'', ''Gerltsch'') is a town in the Germany, German state of Saxony. It is located on the Lusatian Neisse River, and ...
in Lausitz. The citizens of the five Thuringian ''Färberwaid'' (dye woad) towns of
Erfurt
Erfurt () is the capital and largest city in the Central German state of Thuringia. It is located in the wide valley of the Gera river (progression: ), in the southern part of the Thuringian Basin, north of the Thuringian Forest. It sits i ...
,
Gotha
Gotha () is the fifth-largest city in Thuringia, Germany, west of Erfurt and east of Eisenach with a population of 44,000. The city is the capital of the district of Gotha and was also a residence of the Ernestine Wettins from 1640 until the ...
,
Tennstedt,
Arnstadt
Arnstadt () is a town in Ilm-Kreis, Thuringia, Germany, on the river Gera about south of Erfurt, the capital of Thuringia. Arnstadt is one of the oldest towns in Thuringia, and has a well-preserved historic centre with a partially preserved town ...
and
Langensalza
Bad Langensalza (; until 1956: Langensalza) is a spa town of 17,500 inhabitants in the Unstrut-Hainich district, Thuringia, central Germany.
Geography Location
Bad Langensalza is located in the Thuringian Basin, the fertile lowlands along t ...
had their own charters. In Erfurt, the woad-traders gave the funds to found the
University of Erfurt
The University of Erfurt (german: Universität Erfurt) is a public university located in Erfurt, the capital city of the German state of Thuringia. It was founded in 1379, and closed in 1816. It was re-established in 1994, three years after Germ ...
. Traditional fabric is still printed with woad in Thuringia,
Saxony
Saxony (german: Sachsen ; Upper Saxon: ''Saggsn''; hsb, Sakska), officially the Free State of Saxony (german: Freistaat Sachsen, links=no ; Upper Saxon: ''Freischdaad Saggsn''; hsb, Swobodny stat Sakska, links=no), is a landlocked state of ...
and
Lusatia
Lusatia (german: Lausitz, pl, Łużyce, hsb, Łužica, dsb, Łužyca, cs, Lužice, la, Lusatia, rarely also referred to as Sorbia) is a historical region in Central Europe, split between Germany and Poland. Lusatia stretches from the Bóbr ...
today: it is known as ''Blaudruck'' (literally, "blue print(ing)").
Use as Chinese medicine
The woad plant's roots are used in
Traditional Chinese medicine
Traditional Chinese medicine (TCM) is an alternative medical practice drawn from traditional medicine in China. It has been described as "fraught with pseudoscience", with the majority of its treatments having no logical mechanism of action ...
to make a medicine known as ''banlangen'' ( ) that purports to have antiviral properties. ''Banlangen'' is used as an herbal medicinal tea in China for colds and tonsular ailments. Used as a tea, it has a brownish appearance and (unlike most Chinese medicines) is mildly sweet in taste.
Woad and indigo
![Isatis tinctoria 003](https://upload.wikimedia.org/wikipedia/commons/f/f8/Isatis_tinctoria_003.JPG)
The dye chemical extracted from woad is
indigo
Indigo is a deep color close to the color wheel blue (a primary color in the RGB color space), as well as to some variants of ultramarine, based on the ancient dye of the same name. The word "indigo" comes from the Latin word ''indicum'', m ...
, the same dye extracted from "true indigo", ''
Indigofera tinctoria
''Indigofera tinctoria'', also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye.
Description
True indigo is a shrub one to two meters high. It may be an annual plant, annual, bi ...
'', but in a lower concentration. Following the
Portuguese discovery of the sea route to India
The Portuguese discovery of the sea route to India was the first recorded trip directly from Europe to the Indian subcontinent, via the Cape of Good Hope. Under the command of Portuguese explorer Vasco da Gama, it was undertaken during the rei ...
by the navigator
Vasco da Gama
Vasco da Gama, 1st Count of Vidigueira (; ; c. 1460s – 24 December 1524), was a Portuguese explorer and the first European to reach India by sea.
His initial voyage to India by way of Cape of Good Hope (1497–1499) was the first to link E ...
in 1498, great amounts of indigo were imported from Asia. Laws were passed in some parts of Europe to protect the woad industry from the competition of the indigo trade. It was proclaimed that indigo caused yarns to rot: "In 1577 the German government officially prohibited the use of indigo, denouncing it as that pernicious, deceitful and corrosive substance, the Devil's dye." This prohibition was repeated in 1594 and again in 1603. In France,
Henry IV, in an edict of 1609, forbade under pain of death the use of "the false and pernicious Indian drug".
With the development of a chemical process to
synthesize the pigment, both the woad and natural indigo industries collapsed in the first years of the 20th century. The last commercial harvest of woad until recent times occurred in 1932, in
Lincolnshire
Lincolnshire (abbreviated Lincs.) is a county in the East Midlands of England, with a long coastline on the North Sea to the east. It borders Norfolk to the south-east, Cambridgeshire to the south, Rutland to the south-west, Leicestershire ...
, Britain. Small amounts of woad are now grown in the UK and France to supply craft dyers. The classic book about woad is ''The Woad Plant and its Dye'' by J. B. Hurry, Oxford University Press of 1930, which contains an extensive bibliography.
A method for producing blue dye from woad is described in ''The History of Woad and the Medieval Woad Vat'' (1998) . In France, woad was treated with human urine, by a profession known as pisseurs, who would drink large quantities of beer to provide a sufficient supply.
Woad is biodegradable and safe in the environment. In Germany, there have been attempts to use it to protect wood against decay without applying dangerous chemicals. Production of woad is increasing in the UK for use in
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. Thicker ...
s, particularly for
inkjet printer
Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper and plastic substrates. Inkjet printers were the most commonly used type of printer in 2008, and range from small inexpensi ...
s, and dyes. The plant can cause problems, however: ''Isatis tinctoria'' is classified as an
invasive species
An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species ad ...
in parts of the United States.
Invasive and noxious weed
In certain locations, the plant is classified as a non-native and invasive weed. It is listed as a
noxious weed
A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is injurious to agricultural or horticultural crops, natural habitats or ecosystems, or humans or liv ...
by the agriculture departments of several states in the western United States: Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. In Montana, it has been the target of an extensive, and largely successful, eradication attempt.
Notes
References
Sources
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External links
Woad.org.uk - All About Woad - Cultivation, Extraction, Dyeing with Woad, History and facts about woadRex Wailes in Transactions of the Newcomen Society, 1935-36 Vol 16.
USDA information on ''Isatis tinctoria''
{{Authority control
Brassicaceae
Flora of Western Asia
Flora of Siberia
Medicinal plants of Asia
Plant dyes
Medicinal plants of Europe
Plants used in traditional Chinese medicine
Plants described in 1753
Taxa named by Carl Linnaeus