Also Called: 2H-Naphtho[1,2-d]triazole-5-sulfonic acid, 2,2'-[azoxybis[(2-sulfo-4, 1-phenylene)-2,1-ethenediyl(3-sulfo-4,1-phenylene )]]bis-, hexasodium salt;2H-Naphtho[1,2-d]triazole-5-sulfonic acid, 2,2'-[azoxybis[(2-sulfo-4,1-phenylene)-2,1-ethenediyl(3-sulfo-4,1-phenylene)]]bis-, hexasodium salt;2H-Naphtho[1,2-d]triazole-5-sulfonic acid, 2,2'-[(1-oxido-1,2-diazenediyl)bis[(2-sulfo-4,1-phenylene)-2,1-ethenediyl(3-sulfo-4,1-phenylene)]]bis-, sodium salt (1:6)