Birch bark or birchbark is the bark of several Eurasian and North American

birch A birch is a thin-leaved deciduous hardwood tree of the genus ''Betula'' (), in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech- oak family Fagaceae. The genus ''Betula'' contains ...

trees of the genus ''Betula''. The strong and water-resistant cardboard-like bark can be easily cut, bent, and sewn, which has made it a valuable building, crafting, and

writing material Writing material refers to the materials that provide the surfaces on which humans use writing instruments to inscribe writings. The same materials can also be used for symbolic or representational drawings. Building material on which writings or ...

, since

pre-historic Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of ...

times. Today, birch bark remains a popular type of wood for various

handicraft A handicraft, sometimes more precisely expressed as artisanal handicraft or handmade, is any of a wide variety of types of work where useful and decorative objects are made completely by one’s hand or by using only simple, non-automated re ...

s and arts. Birch bark also contains substances of medicinal and chemical interest. Some of those products (such as betulin) also have fungicidal properties that help preserve bark artifacts, as well as food preserved in bark containers.

Collection and storage

Removing birch bark from live trees is harmful to tree health and should be avoided. Instead, it can be removed fairly easily from the trunk or branches of dead wood, by cutting a slit lengthwise through the bark and pulling or prying it away from the wood. The best time for collection is spring or early summer, as the bark is of better quality and most easily removed. Removing the outer (light) layer of bark from the trunk of a living tree may not kill it, but probably weakens it and makes it more prone to

infection An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. An infectious disease, also known as a transmissible disease or communicable dis ...

s. Removal of the inner (dark) layer, the

phloem Phloem (, ) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as ''photosynthates'', in particular the sugar sucrose, to the rest of the plant. This transport process is c ...

, kills the tree by preventing the flow of

sap Sap is a fluid transported in xylem cells (vessel elements or tracheids) or phloem sieve tube elements of a plant. These cells transport water and nutrients throughout the plant. Sap is distinct from latex, resin, or cell sap; it is a separ ...

to the

root In vascular plants, the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often below the su ...

s. To prevent it from rolling up during storage, the bark should be spread open and kept pressed flat.

Working

Birch bark can be cut with a sharp

knife A knife ( : knives; from Old Norse 'knife, dirk') is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evidence ...

, and worked like cardboard. For sharp bending, the fold should be scored (scratched) first with a blunt stylus. Fresh bark can be worked as is; bark that has dried up (before or after collection) should be softened by steaming, by soaking in warm water, or over a fire.

Uses

Birch bark longhouse (Whitefish Island) 3

Birch bark was a valuable construction material in any part of the world where birch trees were available. Containers such as wrappings, bags, baskets, boxes, or

quiver A quiver is a container for holding arrows, bolts, ammo, projectiles, darts, or javelins. It can be carried on an archer's body, the bow, or the ground, depending on the type of shooting and the archer's personal preference. Quivers were trad ...

s were made by most societies well before

pottery Pottery is the process and the products of forming vessels and other objects with clay and other ceramic materials, which are fired at high temperatures to give them a hard and durable form. Major types include earthenware, stoneware and ...

was invented. Other uses include: *In various

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an are ...

n countries (including Siberia) birch bark was used to make storage boxes, paper, tinder, canoes, roof coverings, tents, and waterproof covering for

composite bow A composite bow is a traditional bow made from horn, wood, and sinew laminated together, a form of laminated bow. The horn is on the belly, facing the archer, and sinew on the outer side of a wooden core. When the bow is drawn, the sinew (stre ...

s, such as the

Mongol bow The Mongol bow is a type of Recurve bow, recurved composite bow used in Mongolia. "Mongol bow" can refer to two types of bow. From the 17th century onward, most of the traditional bows in Mongolia were replaced with the similar Manchu bow which is ...

, the Chinese bow,

Korean bow Korean may refer to: People and culture * Koreans, ethnic group originating in the Korean Peninsula * Korean cuisine * Korean culture * Korean language **Korean alphabet, known as Hangul or Chosŏn'gŭl **Korean dialects and the Jeju language ** ...

Turkish bow Turkish may refer to: *a Turkic language spoken by the Turks * of or about Turkey ** Turkish language *** Turkish alphabet ** Turkish people, a Turkic ethnic group and nation *** Turkish citizen, a citizen of Turkey *** Turkish communities and ...

s, Assyrian bow, the

Perso-Parthian bow A composite bow is a traditional bow made from horn, wood, and sinew laminated together, a form of laminated bow. The horn is on the belly, facing the archer, and sinew on the outer side of a wooden core. When the bow is drawn, the sinew (stre ...

. It is still being used. More than one variety of birch is used. *In North America, the native population used birch bark for

canoe A canoe is a lightweight narrow water vessel, typically pointed at both ends and open on top, propelled by one or more seated or kneeling paddlers facing the direction of travel and using a single-bladed paddle. In British English, the ter ...

wigwam A wigwam, wickiup, wetu (Wampanoag), or wiigiwaam (Ojibwe, in syllabics: ) is a semi-permanent domed dwelling formerly used by certain Native American tribes and First Nations people and still used for ceremonial events. The term ''wickiup' ...

s, scrolls, ritual art ( birch bark biting),

map A map is a symbolic depiction emphasizing relationships between elements of some space, such as objects, regions, or themes. Many maps are static, fixed to paper or some other durable medium, while others are dynamic or interactive. Although ...

s (including the oldest maps of North America),

torch A torch is a stick with combustible material at one end, which is ignited and used as a light source. Torches have been used throughout history, and are still used in processions, symbolic and religious events, and in juggling entertainment. I ...

es, fans,

musical instruments A musical instrument is a device created or adapted to make musical sounds. In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument. A person who pl ...

clothing Clothing (also known as clothes, apparel, and attire) are items worn on the body. Typically, clothing is made of fabrics or textiles, but over time it has included garments made from animal skin and other thin sheets of materials and natural ...

, and more. *In Scandinavia and Finland, it was used as the substratum of

sod roof A sod roof, or turf roof, is a traditional Scandinavian type of green roof covered with sod on top of several layers of birch bark on gently sloping wooden roof boards. Until the late 19th century, it was the most common roof on rural log house ...

s and

birch-bark roof A birch-bark roof (in Finnish: ''malkakatto'' or ''tuohikatto'') is a roof construction traditional in Finland and Norway for farmhouses and farm buildings built from logs. The birch-bark roof was the prevailing roof type in rural Finland up unti ...

s, for making boxes, casks and buckets, fishing implements, and shoes (as used by the

Egtved Girl The Egtved Girl (c. 1390–1370 BC) was a Nordic Bronze Age girl whose well-preserved remains were discovered outside Egtved, Denmark in 1921. Aged 16–18 at death, she was slim, tall, had short, blond hair and well-trimmed nails. ...

) similar to

bast shoes Bast shoes are shoes made primarily from bast — fiber taken from the bark of trees such as linden. They are a kind of basket, woven and fitted to the shape of a foot. Bast shoes are a traditional footwear of the forest areas of Northern E ...

. *In Russia, many

birch bark manuscript Birch bark manuscripts are documents written on pieces of the inner layer of birch bark, which was commonly used for writing before the advent of mass production of paper. Evidence of birch bark for writing goes back many centuries and in various ...

s have survived from 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 ...

. *Birch bark knife handles are popular tools to be made currently. *In India, birch-bark, along with dried palm leaves, were the primary writing supports before the widespread advent of paper in the second millennium CE. The oldest known Buddhist manuscripts (some of the

Gandharan Buddhist Texts Gandhāra is the name of an ancient region located in the northwestern region of the Indian subcontinent, more precisely in present-day north-west Pakistan and parts of south-east Afghanistan. The region centered around the Peshawar Vall ...

), from

Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at the crossroads of Central Asia and South Asia. Referred to as the Heart of Asia, it is bordere ...

, were written on birch bark. *Neanderthals used birch bark to make a

tar Tar is a dark brown or black viscous liquid of hydrocarbons and free carbon, obtained from a wide variety of organic materials through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat. "a dark brown or black bi ...

adhesive through the process of dry or destructive distillation. Birch bark also makes an outstanding

tinder Tinder is easily combustible material used to start a fire. Tinder is a finely divided, open material which will begin to glow under a shower of sparks. Air is gently wafted over the glowing tinder until it bursts into flame. The flaming tinder i ...

, as the inner layers will stay dry even through heavy rainstorms.

Medical uses

Birch bark, sold under the brand name Filsuvez, is a

medication A medication (also called medicament, medicine, pharmaceutical drug, medicinal drug or simply drug) is a drug used to diagnose, cure, treat, or prevent disease. Drug therapy ( pharmacotherapy) is an important part of the medical field and ...

that is used to treat

epidermolysis bullosa Epidermolysis bullosa (EB) is a group of rare medical conditions that result in easy blistering of the skin and mucous membranes. Blisters occur with minor trauma or friction and are painful. Its severity can range from mild to fatal. Inherited E ...

(EB). The most common side effects with Filsuvez include wound complications. Other common side effects include skin reactions at the application site, wound infections, pruritus (itching), and hypersensitivity (allergic) reactions. Epidermolysis bullosa is an inherited disease of the skin that makes the skin very fragile and causes severe blistering and scarring. Filsuvez is used in two types of epidermolysis bullosa, dystrophic epidermolysis bullosa and junctional epidermolysis bullosa, to treat partial-thickness skin wounds. These are wounds where the upper layers of the skin have been damaged. Filsuvez is

indicated In medicine, an indication is a valid reason to use a certain test, medication, procedure, or surgery. There can be multiple indications to use a procedure or medication. An indication can commonly be confused with the term diagnosis. A diagnosis ...

for the treatment of partial thickness wounds associated with dystrophic and junctional epidermolysis bullosa (EB) in people aged six months of age and older.

Legal status

On 22 April 2022, the

Committee for Medicinal Products for Human Use The Committee for Medicinal Products for Human Use (CHMP), formerly known as Committee for Proprietary Medicinal Products (CPMP), is the European Medicines Agency's committee responsible for elaborating the agency's opinions on all issues regardin ...

(CHMP) of the European Medicines Agency (EMA) adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Filsuvez, intended for the treatment of

(EB). The applicant for this medicinal product is Amryt Pharmaceuticals DAC. Filsuvez will be available as a gel for cutaneous use. The active substance of Filsuvez is birch bark extract (as dry extract, refined) from ''

Betula pendula ''Betula pendula'', commonly known as silver birch, warty birch, European white birch, or East Asian white birch, is a species of tree in the family Betulaceae, native to Europe and parts of Asia, though in southern Europe, it is only found ...

'' Roth/''

Betula pubescens ''Betula pubescens'' (syn. ''Betula alba''), commonly known as downy birch and also as moor birch, white birch, European white birch or hairy birch, is a species of deciduous tree, native and abundant throughout northern Europe and northern Asia ...

'' Ehrh. (equivalent to 0.5‑1.0 g birch bark), including 84‑95 mg triterpenes calculated as the sum of betulin, betulinic acid, erythrodiol, lupeol and oleanolic acid. It is thought to work by modulating inflammatory mediators and stimulating keratinocyte differentiation and migration, thereby promoting wound healing and closure. Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged. Filsuvez was approved for medical use in the European Union in June 2022. Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.

References

External links

Birchbark articles
from the '' NativeTech'' site.
Birch and Birch Bark
an article by John Zasada at a

University of Minnesota The University of Minnesota, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public land-grant research university in the Twin Cities of Minneapolis and Saint Paul, Minnesota, United States. ...

site.
Birch Bark Canoe
page on the site of the

Algonquin Algonquin or Algonquian—and the variation Algonki(a)n—may refer to: Languages and peoples *Algonquian languages, a large subfamily of Native American languages in a wide swath of eastern North America from Canada to Virginia **Algonquin la ...

s of Pikwàganagàn.
César's Bark Canoe
��Watch a documentary on how to build a Birch bark canoe
Bureau of Catholic Indian Missions Digital Image Collection
at Marquette University; keyword: birch bark.
Wiigwaasi-Jiimaan: These Canoes Carry Culture
��Short documentary featuring the building of an Anishinaabe-Ojibwe birchbark canoe in Wisconsin. * * {{Portal bar , Medicine Writing media Non-timber forest products Native American ethnobotany Combination drugs Orphan drugs