Oxidative hair dyes containing an aminopyrimidine with an aminophenol or alpha-naphthol coupler give more intense shades when dihydroxyacetone, alloxane, methylglyoxal and/or potassium iodide is present

摘要

An aqueous hair dye composition based on an oxidation precursor system comprises: (A) a tetraaminopyrimidine or a triaminohydroxypyrimidine or water-soluble sa (B) a coupler which is 2- or 3-aminophenol, 5- or 6-amino-2-methylphenol and/or alpha -naphthol; (C) dihydroxyacetone, alloxane and methylglyoxal; and (D) potassium iodide. An aqueous hair dye composition based on an oxidation precursor system comprises: (A) a tetraaminopyrimidine or a triaminohydroxypyrimidine or water-soluble sa (B) a coupler which is 2- or 3-aminophenol, 5- or 6-amino-2-methylphenol and/or alpha -naphthol; (C) dihydroxyacetone, alloxane and methylglyoxal; and (D) potassium iodide. The disclosure refers to the dihydroxyacetone, alloxane, methylglyoxal and potassium iodide in an and/or relationship.