nRosaniline(Chem) 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 fuchsineaniline red, etc. By extension, any one of the series of substances derived from, or related to, rosaniline proper.
Century Dictionary and Cyclopedia
nrosanilineAn 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. Thus, fuchsin is the monohydrochlorid and azalein the nitrate of rosaniline. Silk and wool dipped into aqueous solutions of any of the salts withdraw them from solution and become dyed at once. Cotton, on the other hand, does not withdraw the coloring matter, but must be first treated with a mordant of some animal substance, such as albumen. Also called aniline red, roseine, magenta, azalein.
Chambers's Twentieth Century Dictionary
nRosanilinerō-zan′i-lin a derivative of aniline: magenta: roseine.
Webster's Revised Unabridged Dictionary
Rose, + aniline,
Hydrochloride of rosaniline, 9.
"The Dyeing of Woollen Fabrics" by Franklin Beech
Other transformations of rosaniline have yet to be chronicled.