Oxidative hair dyes containing an aminopyrimidine with a diamino 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 1,3-diaminobenzene, 2-amino-4-hydroxyethylaminoanisole and/or 2,4-diaminophenoxyethanol (or salt); (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 1,3-diaminobenzene, 2-amino-4-hydroxyethylaminoanisole and/or 2,4-diaminophenoxyethanol (or salt); (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.