Pararosaniline

Pararosaniline, Basic Red 9, or C.I. 42500 is an organic compound with the formula [(H₂NC₆H₄)₃C]Cl. It is a magenta solid with a variety of uses as a dye. It is one of the four components of basic fuchsine. (The others are rosaniline, new fuchsine and magenta II.) It is structurally related to other triarylmethane dyes called methyl violets including crystal violet, which feature methyl groups on nitrogen.

It is prepared by the condensation of aniline and para-aminobenzaldehyde. Alternative it arises from the oxidation of 4,4'-bis(aminophenyl)methane in the presence of aniline.