1-((2-Hydroxy-1-naphthalenyl)azo)-2-naphthalenesulfonic acid, barium salt (2:1) 2-Naphthalenesulfonic acid, 1-((2-hydroxy-1-naphthalenyl)azo)-, barium salt (2:1) 68189-25-3 Barium 1-((2-hydroxy-1-naphthyl)azo)naphthalene-2-sulphonate(1:2) EINECS 269-183-4