Synonyms: 1,5-Naphthalenedisulfonicacid,3-[[4-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-6-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-,tetrasodium salt (9CI); 1,5-Naphthalenedisulfonic acid,3-[[4-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]-,tetrasodium salt (7CI); C.I. Direct Black 103, tetrasodium salt (8CI); C.I.34179; C.I. Direct Black 103; C.I. Direct Blue 103; Diazol Light Grey 4B;Direct Fast Grey L