Fuchsine or rosaniline hydrochloride is a magenta dye with chemical formula C20H19N3·HCl. There are other similar chemical formulations of products sold as fuchsine, and several dozen other synonyms of this molecule. It becomes magenta when dissolved in water; as a solid, it forms dark green crystals. As well as dying textiles, fuchsine is used to stain bacteria and sometimes as a disinfectant. In the literature of biological stains the name of this dye is frequently mis-spelled, with omission of the terminal e, which indicates an amine[4] American and English dictionaries (Webster's, Oxford, Chambers etc) give the correct spelling, which is also used in the literature of industrial dyeing.

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