Catechu powder 'katha' is manufactured by extracting heartwood of catechu wood [Acacia catechu Willd.] to obtain a solution of katha (a mixture of catechins) and cutch (a dye, for non-food use), adjusting the density of the solution, if required, crystallizing and filtering off the katha. Extraction is performed in a pressurized vessel, externally heated, with water at a wood to water ratio of 1:2 or more. Traditionally, katha may be used as an antioxidant for vegetable oils.

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