| 摘要 |
<p>Composition and process allowing hair coloration by oxidation by using as a colorant precursor, at least a compound of the general formula: (FORMULA) wherein X=CH2, O, S; NH, NR", CH(OH), CHR", CH(NH2), CH(CH3); Y=O, NH; Z=O, S, NH; R=H, OH, R", OR", NR"2, NO2, halogen and R" = alkyl from C1 to C5. The compositions allowing the capillary dying may comprise, besides the colorant precursors of the formula (I), known coloring precursors and direct action colorants, and particularly natural amino acids, the esters and/or amides thereof, as well as redox catalysts. The disclosed compositions, exhibiting a certain ratio of colorant precursors of formula (I) are toxicologically harmless and give stable dyes with a natural look; with the defined precursors, there are provided dyes with stronger shades than those obtained by using di- or polyphenols as colorant precursors. </p> |
