Methods for dyeing keratinous fibers with compositions which con

Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing

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8410, 8411, 8412, 8423, A61K 713

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active

057529825

ABSTRACT:
A method for dyeing keratin fibers, wherein a composition is applied to said fibers which contains, in a suitable dyeing medium, at least one coupler having formula (I) ##STR1## wherein R.sub.1 is hydrogen or alkyl; R.sub.2 and R.sub.3 are hydrogen, alkyl, COOR', where R' is alkyl or hydrogen; R.sub.4 is hydrogen, hydroxyalkyl, alkyl, polyhydroxyalkyl or acetyl or aminoalkyl wherein the amine may be mono- or disubstituted by alkyl; Z.sub.1 and Z.sub.2 are hydrogen, alkyl, hydroxy, halogen, alkoxy or a salt thereof; at least one precursor of an oxidation hair dye; and at least one oxidizing agent, the pH of the composition applied to the fibers being less than 7.

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patent: 5205837 (1993-04-01), Andrean et al.
patent: 5254135 (1993-10-01), Lang et al.
patent: 5364414 (1994-11-01), Lang et al.
ASTM Designation: D 1535-95b, "Standard Practice for Specifying Color by the Munsell System," pp. 1-3, 1995 no month available.

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