1-Naphthalenesulfonic acid, 2-((1-hydroxy-2-naphthalenyl)azo)-, barium salt (2:1) 2-((1-Hydroxy-2-naphthalenyl)azo)-1-naphthalenesulfonic acid, barium salt (2:1) 68189-18-4 Barium 2-((1-hydroxy-2-naphthyl)azo)naphthalenesulphonate (1:2) EINECS 269-178-7