Synonyms: 2,7-Naphthalenedisulfonicacid, 3-hydroxy-4,4'-[1,4-naphthylenebis(azo)]di-, tetrasodium salt (8CI);2,7-Naphthalenedisulfonic acid,4-[[4-[(3,6-disulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-3-hydroxy-,tetrasodium salt (9CI); Brilliant Black B; C.I. 27245