Catechu

Catechu (/ˈkætɪʃuː/ or /ˈkætɪtʃuː/)^[1] is an extract of acacia trees used variously as a food additive, astringent, tannin, and dye. It is extracted from several species of Acacia, but especially Senegalia catechu (previously called Acacia catechu), by boiling the wood in water and evaporating the resulting brew.^[2] The Malay name kachu is the basis of the Latinized^[3] catechu chosen as the Linnaean taxonomy name of the plant species which provides the extract.

Uses

As an astringent it has been used since ancient times in Ayurvedic medicine as well as in breath-freshening spice mixtures—for example in France and Italy it is used in some licorice pastilles. It is also an important ingredient in South Asian cooking paan mixtures, such as ready-made paan masala and gutka.

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. 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.

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.^[4]

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. Palm-catechu is extracted from the seeds of Areca catechu.^[7]

Derivative chemicals

The catechu extract gave its name to the catechin and catechol chemical families first derived from it.

References

^ "catechu". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ Cutch and catechu plant origin Archived 2019-02-10 at the Wayback Machine from the Food and Agriculture Department of the United Nations. Document repository accessed November 5, 2011
^ Derivation of word from Malay
^ Goodwin, Jill (1982). A Dyer's Manual. London: Pelham Books Ltd. p. 60. ISBN 978-0-7207-1327-5.
^ 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

Wikisource has the text of the 1911 Encyclopædia Britannica article "Catechu".

An OCR'd version of the US Dispensatory by Remington and Wood, 1918.

v t e Dyeing
Techniques	Batik Dyeing Ikat Kasuri Kalamkari Katazome Leheria Mordant Reactive dye printing Resist Ring dyeing Rōketsuzome Shibori Tie-dye Tsutsugaki Yūzen
Types of dyes	Dyes Natural Acid Reactive Solvent Substantive Sulfur Vat Disperse Discharge Pigment
Traditional textile dyes	Armenian cochineal Black walnut Bloodroot Brazilin Cochineal Cudbear Cutch Dyewoods Fustic Gamboge Dyer's broom Henna Indigo Kermes Logwood Madder Polish cochineal Saffron Turmeric Tyrian purple Weld Woad
History	Use of saffron Traditional dyes of the Scottish Highlands
Craft dyes	Dylon Inkodye Procion Rit
Reference	Glossary of dyeing terms List of dyes

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