The Collaborative International Dictionary
Garancin
Garancin \Gar"an*cin\ (?; 104), n. [F. garance madder, LL. garantia.] (Chem.) An extract of madder by sulphuric acid. It consists essentially of alizarin.
Wiktionary
garancin
n. (context organic compound English) A pigment extracted from madder by sulphuric acid. It consists essentially of alizarin.