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n. A brownish-red crystalline organic compound, C20H21N3O, derived from aniline and used in the manufacture of dyes and in Schiff's reagent.

n. An organic base, C20H19N3, used to make the dye fuchsine

n. The deep red or magenta colour of fuchsine (rosaniline hydrochloride).

n. A complex nitrogenous base, C20H21N3O, obtained by oxidizing a mixture of aniline and toluidine, as a colorless crystalline substance which forms red salts. These salts are essential components of many of the socalled aniline dyes, as fuchsine, aniline red, etc. By extension, any one of the series of substances derived from, or related to, rosaniline proper.

n. An organic base (C20H21N3O), a derivative of aniline, crystallizing in white needles, capable of uniting with acids to form salts, which are the well-known rosaniline coloring matters of commerce; also, the color thus produced.

"In a series of masterly experiments von Baeyer demonstrated several years ago the chemical nature of the phthaleins and showed that, just like the already known rosaniline dyes, they may be classified as derivatives of the hydrocarbon triphenylmethane."

diphenyl rosaniline    rosaniline-blue