potassium sodium 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]naphthalene-1,3-disulphonate

1,3-Naphthalenedisulfonic acid,7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-,potassium sodium salt

1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-,potassium sodium salt