fuchsin fyo͞ok´sĭn [key] or magentaməjĕn´tə [key], bright red dyestuff consisting of the mixed hydrochlorides or acetates of rosaniline and pararosaniline. It is composed of small crystals possessing a brilliant green sheen; when dissolved they produce a red solution, which dyes animal fibers directly and vegetable fibers after mordanting. The solution is used in the textile and leather industries and as a stain in biology.

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