2-Methyl-4-(o-tolyldiazenyl)benzenamine diazo, coupled with 3-Hydroxynaphthalene-2,7-disulfonic acid (27200). 2-Methyl-4-(o-tolyldiazenyl)benzenaminediazo, and 6-Hydroxynaphthalene-2-sulfonic acid and where did 3-Hydroxynaphthalene-2,7-disulfonic acid mixture of coupling (27201).