3-Hydroxy-4-[(2-hydroxynaphthyl)azo]-7-nitronaphthalene-1-sulphonic acid (CAS No 16279-54-2) and its salts, when used as a substance in hair dye products
Acide 3-hydroxy-4-[(2-hydroxynaphthyl)azo]-7-nitronaphthalène-1-sulfonique (no CAS 16279-54-2) et ses sels, en cas d’utilisation dans des produits de teintures capillaires