Toxicodendron vernicifluum

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Scientific classification Edit this classification
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Binomial name
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(Stokes) F. A. Barkley
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Mature Toxicodendron vernicifluum, Royal Botanic Garden, Edinburgh
Leaves and immature fruit on a mature Toxicodendron vernicifluum, Edinburgh
Fruits of T. vernicifluum

Toxicodendron vernicifluum (formerly Rhus verniciflua[1]), also known by the common name Chinese lacquer tree, is an Asian tree species of genus Toxicodendron native to China and the Indian subcontinent, and cultivated in regions of China, Japan and Korea.[1][2][3] Other common names include poison sumac, Japanese lacquer tree, Japanese sumac, and varnish tree.[4][5] The trees are cultivated and tapped for their toxic sap, which is used as a highly durable lacquer to make Chinese, Japanese, and Korean lacquerware.

The trees grow up to 20 metres tall with large leaves, each containing from 7 to 19 leaflets (most often 11–13). The sap contains the allergenic compound urushiol, which gets its name from this species' Japanese name urushi (Script error: No such module "Nihongo".); "urushi" is also used in English as a collective term for all kinds of Asian lacquerware made from the sap of this and related Asian tree species, as opposed to European "lacquer" or Japanning made from other materials. Urushiol is also the oil found in poison ivy and poison oak, to which the tree is related, that causes a rash.

Uses

Lacquer

Sap, containing urushiol (an allergenic irritant), is tapped from the trunk of the Chinese lacquer tree to produce lacquer. This is done by cutting 5 to 10 horizontal lines on the trunk of a 10-year-old tree, and then collecting the greyish yellow sap that exudes. The sap is then filtered, heat-treated, or coloured before applying onto a base material that is to be lacquered. Curing the applied sap requires "drying" it in a warm, humid chamber or closet for 12 to 24 hours where the urushiol polymerizes to form a clear, hard, and waterproof surface. In its liquid state, urushiol can cause extreme rashes, even from vapours. Once hardened, reactions are possible but less common.[citation needed]

Products coated with lacquer are recognizable by an extremely durable and glossy finish. Lacquer has many uses; some common applications include tableware, musical instruments, fountain pens,[6] jewelry, and bows for archery. There are various types of lacquerware. The cinnabar-red is highly regarded. Unpigmented lacquer is dark brown but the most common colors of urushiol finishes are black and red, from powdered iron oxide pigments of ferrous-ferric oxide (magnetite) and ferric oxide (rust), respectively. Lacquer is painted on with a brush and is cured in a warm and humid environment.[7]

The leaves, seeds, and the resin of the Chinese lacquer tree are sometimes used in Chinese medicine for the treatment of internal parasites and for stopping bleeding. Compounds butein and sulfuretin are antioxidants, and have inhibitory effects on aldose reductase and advanced glycation processes.[8]

Buddhist monks who practiced Sokushinbutsu would use the tree's sap in their ceremony.[citation needed]

Wax

The fruits of T. vernicifluum can also be processed to produce a waxy substance known as Japan wax used for numerous purposes including varnishing furniture and producing candles.[9] The fruits of the trees are harvested, dried, steamed, and pressed to extract the wax, which hardens when cooled.[10]

See also

References

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  1. ^ a b Page Module:Citation/CS1/styles.css has no content."PLANTS Profile for Toxicodendron vernicifluum (Chinese lacquer)". Natural Resources Conservation Service. United States Department of Agriculture. Retrieved 8 August 2011.
  2. ^ Page Module:Citation/CS1/styles.css has no content.Yun-Yang, W.; Yu-Min, D.; Fang-Xing, Y.; Ying, X.; Rong-Zhi, C.; Kennedy, J. F. (2006). "Purification and characterization of hydrosoluble components from the sap of Chinese lacquer tree Rhus vernicifera". International Journal of Biological Macromolecules. 38 (3–5): 232–40. doi:10.1016/j.ijbiomac.2006.02.019. PMID 16580725. S2CID 22810554.
  3. ^ Page Module:Citation/CS1/styles.css has no content.Mabberley, D. J. (2002). The plant-book: A portable dictionary of the vascular plants (2nd ed.). Cambridge, U.K.: Cambridge University Press. p. 286. ISBN 978-0-521-41421-0.
  4. ^ Page Module:Citation/CS1/styles.css has no content."Common Names for Chinese Lacquer (Toxicodendron vernicifluum)". Encyclopedia of Life. Retrieved 10 December 2013.
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  6. ^ Page Module:Citation/CS1/styles.css has no content."Fountain Pens made with Urushi lacquer". www.urushi-lack.de. Archived from the original on 16 March 2015.
  7. ^ Page Module:Citation/CS1/styles.css has no content.Watt, James C. Y.; Ford, Barbara Brennan (1991). East Asian lacquer : the Florence and Herbert Irving collection. The Metropolitan Museum of Art. p. 2. ISBN 978-0-8109-6406-8.
  8. ^ Page Module:Citation/CS1/styles.css has no content.Lee, E. H.; Song, D. G.; Lee, J. Y.; Pan, C. H.; Um, B. H.; Jung, S. H. (August 2008). "Inhibitory effect of the compounds isolated from Rhus verniciflua on aldose reductase and advanced glycation endproducts". Biological and Pharmaceutical Bulletin. 31 (8): 1626–30. doi:10.1248/bpb.31.1626. PMID 18670102.
  9. ^ Page Module:Citation/CS1/styles.css has no content."国家标准计划 - 全国标准信息公共服务平台" [Toxicodendron Vernicifluum Seeds]. std.samr.gov.cn. Retrieved 22 October 2019.
  10. ^ Page Module:Citation/CS1/styles.css has no content."伝統産業 木蝋 こだわりの製法貫く | 長崎新聞" [Traditional Industry: Wood Wax – Upholding a Meticulous Production Method]. this.kiji.is (in 日本語). 長崎新聞. 11 December 2018 [2018-10-28]. Archived from the original on 22 October 2019. Retrieved 22 October 2019.

Further reading

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