1,3-Naphthalenedisulfonic acid, 7-((4-amino-5-methoxy-2-methylphenyl)azo)-, potassium sodium salt 1,3-Naphthalenedisulfonic acid, 7-((4-amino-5-methoxy-o-tolyl)azo)-, potassium sodium salts (1:x:x) 79255-89-3