| 摘要 |
<p>Process for dyeing keratinous fibres, wherein at least one composition (A) containing at least one aminoindole in a medium suitable for dyeing is applied on these fibres, the application of the composition (A) being preceded or followed by the application of a composition (B) containing at least one quinone derivative chosen from ortho- or para-benzoquinones, ortho- or para-benzoquinone monoimines or diimines, 1,2- or 1,4-naphthoquinones, ortho- or para-benzoquinone sulphonimides, alpha , omega -alkylene bis(1,4-benzoquinones) or 1,2- or 1,4-naphthoquinone monoimines or diimines in a medium suitable for dyeing, the aminoindoles and the quinone derivatives being chosen in such a way that the difference in oxidation-reduction potential DELTA E between the oxidation-reduction potential Ei of the aminoindoles, determined at pH 7 in a phosphate medium with a vitreous carbon electrode by voltammetry, and the oxidation-reduction potential Eq of the quinone derivative, determined at pH 7 in phosphate medium by polarography with a mercury electrode relative to the saturated calomel electrode, is such that:
DELTA E = Ei-Eq </=470 mV. </p> |
