1-Naphthalenesulfonic acid, 6-((5-chloro-2-hydroxy-3-sulfophenyl)azo)-5-hydroxy-, disodium salt 3624-68-8 C.I. MORDANT BLUE 9, DISODIUM SALT EINECS 222-828-3 Sodium 6-(5-chloro-2-hydroxy-4-sulphophenylazo)-5-hydroxynaphthalene-1-sulphonate