7-hydroxy-1,3-naphthalenesulfonic acid, potassium salt 7-hydroxynaphthalene-1,3-disulphonic acid, potassium salt 1,3-Naphthalenedisulfonic acid, 7-hydroxy-, potassium salt 1,3-Naphthalenedisulfonic acid,7-hydroxy-,potassium salt 3-naphthalenedisulfonic acid, 7-hydroxy- potassium salt 3-naphthalenedisulfonic acid, 7-hydroxy- potassiumsalt Monopotassium 2-naphthol-6,8-disulfonate 7-Hydroxy-1,3-naphthalenedisulfonic acid/potassium,(1:x) salt