What is QUEBRACHO EXTRACT,?

used in tanning and dyeing as a substitute for catechu and sumach, is obtained from the wood of trees which grow abundantly in Brazil and the River Plate districts of Argentine and Paraguay. The dry extract contains about 65 per cent, tannin. The production for 1919 amounted to upwards of 170,000 tons.

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Definition of  QUEBRACHO EXTRACT,