6-Amino-4-hydroxy-5-(4-nitro-2-sulfophenylazo)-2-naphthalenesulfonic acid disodium salt 6-Amino-4-hydroxy-5-[(4-nitro-2-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt C.I.17025 disodium 6-amino-4-hydroxy-5-[(4-nitro-2-sulphonatophenyl)azo]naphthalene-2-sulphonate Acid Violet 1 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-5-(4-nitro-2-sulfophenyl)azo-, disodium salt C.I.Acid Violet 1 Acid Fast Violet RR