Method for dyeing fibers containing keratin

Details Method for dyeing fibers containing keratin Method for dyeing fibers containing keratin

2006-05-22

2008-08-19

Elhilo, Eisa B (Department: 1796)

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Hair dyeing

C008S406000, C008S410000, C008S411000, C008S412000, C008S435000, C008S485000, C132S202000, C132S208000, C424S070600

Reexamination Certificate

active

07413579

ABSTRACT:
A method for dyeing keratin-containing fibers, in particular, human hair comprising the steps of: (A) contacting the hair with a dyeing composition, comprising color-imparting components for a contact time Z1; (B) rinsing the hair a to remove the dying composition; (C) optionally drying the rinsed hair; (D) contacting at least a portion of the hair from step (B) or (C) with a lightening or nuancing agent comprising, in a cosmetic carrier, at least one thickener, hydrogen peroxide and at least one alkalinizing agent for a contact time Z2; and (E) rinsing the hair to remove the adjusting agent; wherein the dyeing composition comprises a color-imparting component comprising,(a) at least two oxidation dye precursors, where at least one oxidation dye precursor must be of the developer type or(b) at least two oxo dye precursors, where at least one oxo dye precursor must be a reactive carbonyl compound.The method ensures a uniform lightening of keratin-containing fibers dyed with dyeing compositions, and produces uniform and natural-looking, lightened color reflections over the entire head hair area.

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