1-(2-Hydroxy-4-sulfo-6-nitro-1-naphthylazo-2-naphthol 1-Naphthalenesulfonic acid, 3-hydroxy-4-((2-hydroxy-1-naphthalenyl)azo)-7-nitro- 16279-54-2 3-Hydroxy-4-((2-hydroxynaphthyl)azo)-7-nitronaphthalene-1-sulphonic acid 3618-58-4 75790-88-4 C.I. Mordant Black 1 C.I. Mordant Black 1, free acid EINECS 240-379-1 Solochrome Black AS, (free acid)