2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[2-[7-sulfo-4-[2-(4-sulfophenyl)diazenyl]-1-naphthalenyl]diazenyl]-, sodium salt (1:4); 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]-1-naphthalenyl]azo]-, tetrasodium salt (9CI); 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[[7-sulfo-4-[(p-sulfophenyl)azo]-1-naphthyl]azo]-, tetrasodium salt (7CI); C.I. Food Black 2, tetrasodium salt (8CI); Black 7984; Black No. 2; C Black 7; C.I. 27755; C.I. Food Black 2; Daiwa Black FS 20; E 152; E 152 (dye); Food Black 2; Pro-Jet Fast Black 2 Liquid