Catechu extract is obtained from heart wood of acacia catechu tree. Cutch extract contains catechol type of tannins. It is more astringent having high tannin non tannin ratio. It produce light brown colour leather. It is also an alternative of mimosa and quebracho. It is widely used in tanning and dying of leather because of its fast, standardized and settled results. It produces brown and olive hues with different mordant. It has resistance property to mildew attack Specifications— Appearance: light to dark brown blocks and free flowing powder Moisture max: 10 to 13.0% Tannins min.: 52.0% -- 60 % Non tannins : 20 –30 % Insoluble -- 2 to 5 % Solubles -- 83 to 90 % Ph 10% solution -- 4.00 to 4.5 25 kg