Members of the safranin class of dye-stuffs. They are violet-blue to gray-blue in color, and are formed upon heating various azo-azobenzenes and amido-azo- benzenes with anilin hydrochlorids. They are also called nigrosins. They are used to impart a blue color to wool, cotton, and silk. See Pigments, Conspectus of.

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Definition of  INDULINS