Nigrosine

noun

1. Any of a class of dyes, varying from blue to black, used in the manufacture of inks and for dyeing wood and textiles.
2. A coal-tar color used in dyeing, prepared from the hydrochlorid of violaniline.
3. The name is applied to three different coal-tar colors:
4. Spirit-soluble nigrosine, which is closely allied to spirit-soluble induliue.
5. Water-soluble nigrosine, which is the sodium salt of certain snlphonic acids of spirit-soluble nigrosine.