- Method for dyeing dry hair
-
The present invention relates to methods for dyeing keratinous fibers, without significantly damaging the hair. According to the method of the present invention the fibers are treated in a dry state by contacting said fibers with at least one oxidoreductase and at least one dye precursor. In this way it is possible to dye, e.g. human hair, in a simple and efficient manner.
- -
-
-
- Methods of dyeing keratin fibers with compositions containing pyrazolo-azole couplers
-
The present invention relates to a composition for dyeing keratinous fibers, especially human hair, which in a medium appropriate for dyeing comprises: as coupler at least one compound of formula: ?in which: R1is especially hydrogen, alkyl, aryl, a heterocycle, a halogen, etc.; R2is especially hydrogen, halogen, aryloxy, alkoxy, acyloxy, arylthio, alkylthio, heteroarylthio, heteroaryloxy, etc.; Za, Zband Zcare independently a nitrogen atom or a carbon which carries a radical R3or R4whose meanings are identical to those of R1; at least one of Za, Zband Zcis a nitrogen atom; and R3and R4may together form an unsubstituted or substituted aromatic ring; and at least one oxidation base.
- -
-
-