Induline

Induline is a dye of blue, bluish-red or black shades.[1] Induline consists of a mixture of several intensely colored species, so the name is often indulines. It was one of the first synthetic dyes, discovered in 1863 by J. Dale and Heinrich Caro. The main components of induline are various substituted phenazines. Although induline no longer in use, the related dye nigrosin is still produced commercially.[2]

Structure of a major component of the dye induline.[2]
  1. ^  One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Indulines". Encyclopædia Britannica. Vol. 14 (11th ed.). Cambridge University Press. p. 507.
  2. ^ a b Horst Berneth (2012). "Azine Dyes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_213.pub3. ISBN 978-3527306732.