What is "violaniline"

Violaniline \Vi`o*lan"i*line\, n. [Violet + aniline.] (Chem.) A dyestuff of the induline group, made from aniline, and used as a substitute for indigo in dyeing wool and silk a violet-blue or a gray-blue color.

n. (context chemistry English) An induline dyestuff made from aniline and formerly used as a substitute for indigo in dyeing wool and silk.