| Catechu a substance obtained from the wood of the East Indian acacia (Acacia catechu) of the family Leguminosae (the plant is native to India and Sri Lanka). By boiling small pieces of the wood, an extract is obtained. After evaporation, the extract becomes a thick reddish brown mass. Catechu contains 55-60 percent tannin. It dissolves in acetic acid and is precipi-tated from solution by sulfuric acid or gelatin. Catechu is usedto tan hides and, when oxidized by potassium bichromate, it is used as a dye for cotton and silk fabrics.It is used in leather tannin
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