A study was made of physical and chemical changes that take place during bleaching of Rangeeni and Kusmi , the two main varieties of lac, by the improved hypochlorite bleaching process. The physical changes studied include life, flow and keeping quality. The chemical changes observed were oxidation, addition, substitution and partial hydrolysis. Fractionation and intrinsic viscosity, however, showed little overall molecular change.
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B. B. Khanna (1970) studied this question.
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