A complex nitrogenous base, C20H21N3O, obtained by oxidizing amixture of aniline and toluidine, as a colorless crystallinesubstance which forms red salts. These salts are essential componentsof many of the socalled aniline dyes, as fuchsine, aniline red, etc.By extension, any one of the series of substances derived from, orrelated to, rosaniline proper.

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