Catechu
Catechu (/ˈkætɪʃuː/ or /ˈkætɪtʃuː/)[1] is a plant extract that, under the name cutch, is used as a brown dye, in tanning, and to preserve fishing nets and sails.[2]
Related extracts include white cutch, or gambier, which is obtained from Uncaria gambir,[3] and palm-catechu, which is extracted from the seeds of Areca catechu.[4]
Uses
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As an astringent, it has been used since ancient times in Ayurvedic medicine,[citation needed] as well as in breath-freshening spice mixtures, for example in France and Italy, in some licorice pastilles.[citation needed] It is also an important ingredient in South Asian cooking paan mixtures, such as ready-made paan masala and gutka.[citation needed]
The catechu mixture is high in natural vegetable tannins (which accounts for its astringent effect), and may be used for the tanning of animal hides.[citation needed] Early research by Humphry Davy in the early 19th century first demonstrated the use of catechu in tanning over more expensive and traditional oak extracts.[citation needed]
Under the name cutch, it is a brown dye used for tanning and dyeing and for preserving fishing nets and sails. Cutch will dye wool, silk, and cotton a yellowish-brown. Cutch gives gray-browns with an iron mordant and olive-browns with a copper mordant.[2]
Black catechu has recently also been used by Blavod Drinks Ltd. to dye their vodka black.[5]
White cutch, also known as gambier, gambeer, or gambir, which is extracted from Uncaria gambir[6] has the same uses.[clarification needed][citation needed] Palm-catechu is extracted from the seeds of Areca catechu.[7]
Derivative chemicals
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The catechu extract gave its name to the catechin and catechol chemical families first derived from it. Its historic name is "Japanese Earth" or "Japanese Dirt", which is responsible for naming "Japanic acid".
See also
[edit source]References
[edit source]- ↑ "catechu". Oxford English Dictionary (online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- 1 2 Goodwin, Jill (1982). A Dyer's Manual. London: Pelham Books Ltd. p. 60. ISBN 978-0-7207-1327-5.
- ↑ Tanning, Dye & Processing Materials
- ↑ Buchheister G.A.: Handbuch der Drogisten-Praxis. Zweite Auflage, Springer, 1891, p. 322, Catechu at the Internet Archive.
- ↑ Valli Herman (29 October 2003). "They drink this stuff?". LA Times. Retrieved 11 March 2019. See this reference for the use of the dye in vodka
- ↑ Tanning, Dye & Processing Materials
- ↑ Buchheister G.A.: Handbuch der Drogisten-Praxis. Zweite Auflage, Springer, 1891, p. 322, Catechu at the Internet Archive.
External links
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| Techniques |  | |
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| Types of dyes | ||
| Traditional textile dyes | ||
| History | ||
| Craft dyes | ||
| Reference | ||
