The animated bases of fuchsine or magenta dyes. The rosanilines are colourless, crystalline compounds, and only form dyes when united with an acid. Rosaniline and pararosaniline are obtained by precipitation of their salts with alkalies. The actual dyes are the salts of these compounds, and include magenta, otherwise known as fuchsine, rosaline nitrate , rosaniline acetate , and parafuchsiue. These all dye wool and silk without a mordant, giving a magnificent fuchsinered colour in solution, but are themselves in crystalline form, of a bright metallic green lustre. They are soluble in hot water and alcohol. Rosaniline yields rosolic acid by treatment with nitrous acid. The formulae of rosaniline and pararosaniline may be shown as below:

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Definition of  ROSANILINES