Synonyms: Naphtho[2,3-f]quinoline-7,12-dione,5,6,10-trihydroxy-, compd. with sodium sulfite (NaHSO3) (1:2) (8CI);Naphtho[2,3-f]quinoline-7,12-disulfonic acid,7,12-dihydro-5,6,7,10,12-pentahydroxy-, disodium salt (9CI); Sodium sulfite,NaHSO3, compd. with 5,6,10-trihydroxynaphtho[2,3-f]quinoline-7,12-dione (2:1);Alizarine Black S; C.I. 67430