erythrogen

from The Century Dictionary.

• noun A fatty, green crystalline compound, said to occur in certain specimens of pathological bile.
• noun A substance, possibly a chromogen, found in flowers.

from the GNU version of the Collaborative International Dictionary of English.

• noun Carbon disulphide; -- so called from certain red compounds which it produces in combination with other substances.
• noun A substance reddened by acids, which is supposed to be contained in flowers.
• noun A crystalline substance obtained from diseased bile, which becomes blood-red when acted on by nitric acid or ammonia.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun carbon disulphide
• noun A substance reddened by acids, supposed to be contained in flowers.
• noun A crystalline substance obtained from diseased bile, which becomes blood-red when acted on by nitric acid or ammonia.