Benzoic acid, 2-hydroxy-3-methyl-, coupled with 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid, 6-amino-4-hydroxy-2-naphthalenesulfonic acid and diazotized 2,2'-(1,2-ethenediyl)bis[5-aminobenzenesulfonic acid], potassium sodium salts, compds. with triethanolamine