Process for dyeing keratinous fibres with 5,6-dihydroxy-indole and hydrogen peroxide, preceded or followed by a treatment with an iodide
AssigneeL'oreal
InventorsJean F. Grollier, Didier Garoche
Life of this patent
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Abstract
The invention relates to a process for dyeing keratinous fibers characterized in that at least one composition comprising, in a medium suitable for dyeing, 5,6-dihydroxyindole in combination with hydrogen peroxide at a pH of between 2 and 7 is applied to these fibers, the application of said composition being preceded or followed by the application of a composition comprising iodide ions in a medium suitable for dyeing.
Claims22
Process for dyeing keratinous fibers, characterized in that at least one composition (A) comprising, in a medium suitable for dyeing, 5,6-dihydroxyindole in proportions of between 0.01 and 5% by weight in combination with hydrogen peroxide at a concentration from 1 to 40 volumes at a pH of between 2 and 7 is applied to these fibers, the application of composition (A) being preceded or followed by the application of composition (B) comprising iodide ions in proportions of between 0.007 and 4% by weight expressed as I.sup.- ions in a medium suitable for dyeing.
Device with several compartments or "kit" for dyeing keratinous fibers, comprising a first compartment containing a composition comprising iodide ions in proportions of between 0.007 and 4% by weight as I.sup.- ions in a medium suitable for dyeing, a second compartment containing a composition comprising 5,6-dihydroxyindole in proportions of between 0.01 and 5% by weight in a medium suitable for dyeing, and a third compartment containing a composition of 1 to 40 volume hydrogen peroxide at a pH of between 2 and 7, the composition contained in the third compartment being intended to be mixed with the contents of the second compartment at the time of use.
Dependencies are inferred from the claim text.