| abstract |
New hair dyes contain at least one 2,3-diamino-6-methoxy-pyridine of the general formula as oxidation dye precursors in which R represents hydrogen, an alkyl group with 1-4 carbon atoms or a hydroxyalkyl group with 2-4 carbon atoms, in combination with at least one aromatic 1,2-diamine, 1,4-diamine, 2-aminophenol and / or 4-aminophenol. R preferably represents a methyl or a hydroxyethyl group. The combination of oxidation dye precursors according to the invention results in brilliant, deep blue shades of high lightfastness and thermal stability. |