6-[[(3,6-dichloropyridazin-4-yl)carbonyl]amino]-4-hydroxy-3-[(4-sulphophenyl)azo]naphthalene-2-sulphonic acid, potassium sodium salt

6-[[(3,6-Dichloropyridazine-4-yl)carbonyl]amino]-4-hydroxy-3-[(4-sulfophenyl)azo]naphthalene-2-sulfonic acid/potassium/sodium,(1:x:x) salt