erythrogen
E*ryth"ro*gen, n. Etym: [Gr. -gen.] (Chem.) (a) Carbon disulphide; -- so called from certain red compounds which it produces in combination with other substances. (b) A substance reddened by acids, which is supposed to be contained in flowers. (c) A crystalline substance obtained from diseased bile, which becomes blood-red when acted on by nitric acid or ammonia.