N1-(Tris(idrossimetil))metil-4-nitro-1,2-fenilendiammina (HC Yellow n. 3) e suoi sali, se usati come sostanze nelle tinture per capelli ###>N1-(Tris(hydroxymethyl))methyl-4-nitro-1,2-phenylenediamine (HC Yellow No. 3) and its salts, when used as a substance in hair dye products