Birch bark or birchbark is the bark of several Eurasian and North American birch trees of the genus Betula. The strong and water-resistant cardboard-like bark can be easily cut, bent, and sewn, which made it a valuable building, crafting, and writing material, since pre-historic times. Even today birch bark remains a popular type of wood for various handicrafts 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. A Russian birch bark letter (14th century). Contents 1 Collection and storage 2 Working 3 Uses 4 See also 5 References 6 External links // Collection and storage

Birch bark can be removed fairly easily from the trunk or branches, living or recently dead, 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 infections. Removal of the inner (dark) layer, the phloem, kills the tree by preventing the flow of sap to the roots.

To prevent it from rolling up during storage, the bark should be spread open and kept pressed flat. Birchbark box with lid and bottom of birch wood Working Birch bark can be cut with a sharp knife, 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 Finnish fishing net weights made out of birch bark and stones North American birchbark canoe

Birch bark was a valuable construction material in any part of the world where birch trees were available. Containers like wrappings, bags, baskets, boxes, or quivers were made by most societies well before pottery was inventedcitation needed. Other uses include: In various Asian countries (including Sibiria) birch bark was used to make storage boxes, paper, tinder, canoes, roof coverings, tents, and waterproof covering for composite bows, such as the Mongol bow, the Chinese bow, Korean bow, Turkish bows, Assyrian bow, the Perso-Parthian bow....etc. It is still being used.More than one variety of birch is being used. In North America, the native population used birch bark for canoes, wigwams, scrolls, ritual art (birch bark biting), maps (including the oldest maps of North Americacitation needed), torches, fans, musical instruments, clothing, and more. In Scandinavia and Finland, it was used as the substratum of sod roofs and birch-bark roofs, for making boxes, casks and buckets, fishing implements, and shoes (as used by the Egtved Girl), etc.. In Russia, many birch bark documents have survived from the Middle Ages. In the Indian civilization birch-bark, along with dried palm leaves, replaced parchment as the primary writing medium. The oldest known Buddhist manuscripts (some of the Gandharan Buddhist Texts), from Afghanistan, were written on birch barkcitation needed.

Birch bark also makes an outstanding tinder, as the inner layers will stay dry even through heavy rainstorms. To render birch bark useless as tinder, it must be soaked for an extended period. See also Mazinibaganjigan (Ojibwa birch bark decorative designs) Wiigwaasabak (Ojibwa birch bark scrolls) "Wiigwaas" entry in Wiktionary References The Algonquin Birchbark Canoe () by David Gidmark. [1] External links Wikimedia Commons has media related to: Birch bark The Birch Bark Torch, a Wilderness Way Magazine's article by Kevin Finney. Birchbark articles from the NativeTech site. Birch and Birch Bark, an article by John Zasada at a University of Minnesota site. Birch Bark Canoe Building Courses at the North House Folk School, Minnesota. Birch Bark Canoe page on the site of the Algonquins of Pikwàganagàn. http://www.davidmosesbridges.com (Traditional Wabanaki Birch-Bark Craft) 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.