†(a) The yellow colouring matter of saffron. Now Obsolete. (b) A coal-tar colour which dyes yellowish-red. Also, any of a large class of azine…

A chromium compound used in dyeing (e.g. sodium dichromate) or tanning.

a group of coal-tar colours.

(a) An organic compound containing the group N N. (b) One of a group of heterocyclic organic compounds with two, three, four, etc., nitrogen atoms…

Any salt-forming group that, when combined with a chromogen, produces a dyestuff.

a hydrol that is an important intermediate for the synthesis of triphenylmethane dyes; 4,4′-bis(dimethylamino)benzhydrol, [C6H4N(CH3)2]2CHOH.

A hypsochromic atom or group.

Any of a class of neutral dyes, many of which are used as sensitizers for photographic emulsions, in which a nitrogen atom (usually part of a basic…