1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-(phenylazo)phenyl)azo)-, potassium sodium salt 7-Hydroxy-8-((4-(phenylazo)phenyl)azo)-1,3-naphthalenedisulfonic acid, potassium, sodium salt 70321-81-2 EINECS 274-568-5 Potassium sodium 7-hydroxy-8-((4-(phenylazo)phenyl)azo)naphthalene-1,3-disulphonate