Erythrogen
Erythrogen , noun
[Greek 'eryqro`s red + -gen.]
(a)
(Chemistry) Carbon disulphide; -- so called from certain red compounds which it produces in combination with other substances.
(b)
(Chemistry) A substance reddened by acids, which is supposed to be contained in flowers.
(c)
(Chemistry) A crystalline substance obtained from diseased bile, which becomes blood-red when acted on by nitric acid or ammonia.