Synonyms: Phenamine Black F;Diphenyl Black FF;Phenamine Black FCW;C.I. Direct Black 9 (VAN) (8CI);Pontamine Fast Black CN;Chrome Leather Black PLS;Carbide Milling Black PLS;EINECS 232-321-9;NSC 71962;C.I. 31560;C.I. 31565;2-Naphthalenesulfonic acid, 3-((4-((4-amino-6(or 7)-sulfo-1-naphthalenyl)azo)phenyl)azo)-6-((2,4-diaminophenyl)azo)-4-hydroxy-, disodium salt (9CI);2-Naphthalenesulfonic acid, 3-((4-((4-amino-6(or 7)-sulfo-1-naphthalenyl)azo)phenyl)azo)-6-((2,4-diaminophenyl)azo)-4-hydroxy-, disodium salt;2-Naphthalenesulfonic acid, 3-(2-(4-(2-(4-amino-6(or 7)-sulfo-1-naphthalenyl)diazenyl)phenyl)diazenyl)-6-(2-(2,4-diaminophenyl)diazenyl)-4-hydroxy-, sodium salt (1:2);8003-62-1;Disodium 3-((4-((4-amino-6(or 7)-sulphonatonaphthyl)azo)phenyl)azo)-6-((2,4-diaminophenyl)azo)-4-hydroxynaphthalene-2-sulphonate