2-Naphthalenesulfonic acid, 6-hydroxy-5-((4-((4-(phenylamino)-3-sulfophenyl)azo)-1-naphthalenyl)azo)-, disodium salt 6262-07-3 Acid Black 26 Benzenesulfonic acid, 2-(phenylamino)-5-((4-((2-hydroxy-6-sulfonaphth-1-yl)azo)naphth-1-yl)azo)-, disodium salt Disodium 6-hydroxy-5-((4-((4-(phenylamino)-3-sulphonatophenyl)azo)naphthyl)azo)naphthalene-2-sulphonate EINECS 228-412-8