The present application relates to a colouring solid particle for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a core containing one or more direct dyes and/or one or more oxidation dye precursors and an upper coating layer covering said core and containing one or more cellulose ethers. The present application also relates to a process for preparing a dye composition comprising one or more colouring solid particles, to a process for the oxidation dyeing of keratin fibres, comprising the application of the composition obtained to said fibres, and to the use of this composition for dyeing keratin fibres.

The present patent application relates to a process for preparing a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a step of mixing several identical or different solid particles comprising one or more dyes, preferably one or more oxidation dye precursors, with an oxidizing aqueous composition, followed by a step of adding an alkaline aqueous composition preferably comprising arginine. The present patent application also relates to a dyeing process using the composition obtained.

The object of the present disclosure is a process for decolorizing keratinous material which has been colored by the application of at least one pigment, wherein a decolorizing agent which is (a) at least one salt of a monovalent or divalent cation, and (b) has a pH value of 1.0 to 4.7,
is applied to the dyed keratin material and rinsed off again after a contact time.

This disclosure relates to a composition for coloring hair containing comprising a multi-lamellar gel emulsion, which includes a haircolor formulation, and a method of making the same. The multi-lamellar gel emulsion includes about 0.5 wt % to about 4.0 wt % of cosmetically acceptable emulsifying fats, a cosmetically acceptable non-ionic surfactant, a water-soluble suspending polymer, and at least 80 wt % of water.

The present invention relates to novel 1-hexyl-1H-pyrazole-4,5-diamine derivative compounds of formula (I), to a composition for oxidation dyeing of the keratin fibres containing same, to a process for preparing the compounds of formula (I), to reaction intermediates, to an oxidation dyeing process using the composition, to the use of the compounds of formula (I) for oxidation dyeing of keratin fibres, and also to a kit; and to the 1-hexyl-4,5-diaminopyrazole derivative compounds of formula (I) below: ##STR00001##
and also the addition salts thereof with organic or mineral acids, the tautomers thereof, and the solvates thereof such as hydrates, in which ALK is as defined in the description.

The present invention relates to a process for coloring keratin fibers, preferably hair, comprising the steps of: (i) applying onto the keratin fibers a composition comprising (a) at least one compound chosen from alkylaminosulfonic acids and those of the formula (I) and (II), (b) at least one direct dye, and (c) at least one alkaline agent; (ii) heating the keratin fibers; and (iii) optionally rinsing and/or drying the keratin fibers. The present invention can provide superior coloring efficiency, such as color intensity and color lastingness.

Provided are indigo darkener, containing: in parts by weight, 0.1-99 of indigo dye, 0-99 of alkaline dyeing assistant, 0.01-99 of acidic dyeing assistant, and 0-99 of oxidizing agent, and hair dyeing process using the indigo darkener. The multi-layer scales on the surface of hair are opened at large angles under alkaline condition and/or high-temperature condition, so that large indigo dyeing particles are easily absorbed in the scales; black indigo oxocarbon or carbon black is generated under the action of alkaline dyeing assistant and oxidizing agent at high temperature by the property that the indigo dye is easy to oxidize; the acidic dye assistant is added as the temperature decreases, and the scales having opening angles on the surface of hair are closed under acidic condition, so that the indigo carbide is firmly clamped and fixed in the scales of hair; finally, the blue indigo dyes white hair into black.

Aspects of the invention include a method of treating hair of a subject with an artificial melanin material comprises contacting in a solution artificial melanin precursors with an oxidizing agent at a temperature greater than or equal to 30° C. in the presence of the hair of the subject to form the artificial melanin material; wherein the artificial melanin material associates with the hair of the subject, thereby treating the hair of the subject. Optionally, the contacting step results in deposition of the artificial melanin material on the hair of the subject and/or uptake of the artificial melanin material into the hair of the subject.

An aqueous oxidizing composition comprising a xanthine derivative is described. The composition may comprise more than 5% by weight of hydrogen peroxide. The composition may further comprise a lipophilic compound or a surfactant, and may be applied to keratin fibers. It has been unexpectedly found out that xanthine derivatives stabilize hydrogen peroxide compositions during storage.

Disclosed is the use of certain alkanolamines for use in hair treatment compositions as a replacement for some or all ammonium hydroxide. When used as hair colorant alkalizers, these derivatives demonstrate reduced hair fiber damage, effective color lifting, and significant improvement in cytotoxicity and malodor compared to well known replacements for ammonium hydroxide.