INDULINE
Etymology
Noun
induline (plural indulines)
(organic compound) Any of a series of blue, bluish-red and black dyestuffs, formed by the interaction of para-amino azo compounds with primary monoamines in the presence of a small quantity of a mineral acid.
Source: Wiktionary
In"du*line, n. Etym: [Perh. fr. indigo.] (Chem.)
(a) Any one of a large series of aniline dyes, colored blue or
violet, and represented by aniline violet.
(b) A dark green amorphous dyestuff, produced by the oxidation of
aniline in the presence of copper or vanadium salts; -- called also
aniline black.
Source: Webster’s Unabridged Dictionary 1913 Edition