Abstract: The subject of the present application is an agent for the oxidative dyeing of keratinous fibers, in particular human hair, which contains the coupling oxidation dye precursor 2-(1,3-benzodioxol-5-ylamino)ethanol in combination with the oxidation base 2-methoxymethyl-para-phenylenediamine.

Abstract: A hair coloring method may include a step of applying a mixture of the following (A) and (B) in a predetermined ratio: (A) a hair coloring agent comprising at least a basic dye, a HC dye, a second amino acid, a first cationic surfactant, a thickener, an oil agent, a first pH adjusting agent, a wetting agent and at least one selected from the group consisting of thioglycolic acid, cysteine, 3-mercapto-1,2-propanediol, cysteamine, and derivatives and salts thereof, wherein the pH of the hair coloring agent is pH 3.5 or higher, and (B) a hair cosmetics comprising at least an alkaline agent, a first amino acid, higher alcohols having 12 to 22 carbon atoms, a surfactant, and a thickener. The hair coloring method may further include a step of providing a predetermined time after the application.

Abstract: This invention relates to an oxidative hair cream composition that contains at least one oxidative hair cream ingredient and at least one polymeric colorant.

Abstract: Disclosed are controlled release particles, each controlled release particle of which includes: (a) a core including at least one hydrophobic active material and an emulsifier which is an oil-soluble or oil-dispersible lecithin emulsifier; and (b) a wall at least partially surrounding the core and including an acid insoluble polymer, a colloidal silica, a water insoluble divalent salt, a film forming polymer, and optionally a powder flow aid, wherein the controlled release particle is configured to retain the at least one hydrophobic active material when exposed to an acidic aqueous solution with a pH less than 6, and to release the at least one hydrophobic active material when exposed to a basic aqueous solution with a pH greater than 7. A method for preparing the particles and compositions containing the particles are also disclosed.

Abstract: A process is described for the preparation of a hair treatment composition, which comprises the following process steps: a) Providing a water phase (Ia) comprising water and optionally other components and heating the water phase to a temperature of from about 70 to about 95° C., b) Providing an oil phase (Ib) comprising at least one oil and at least one emulsifier, and adding the oil phase to the heated water phase from step a), c) Homogenize the mixture from step b), d) Cooling the emulsion resulting from step c) to a temperature of from about 35 to about 45° C. and optionally adding further active ingredients, e) Filling of the emulsion resulting from step d) into preferably transparent containers, whereby in the resting state after from about 10 to about 90 minutes a separation into a water phase (II) and an emulsion phase (IIb) occurs.

Abstract: The disclosure relates to hair color base compositions comprising an alkoxylated fatty alcohol, a fatty acid, a fatty alcohol, a buffer system, and optionally a thickening agent and/or colorant compound, hair color altering compositions comprising the hair color base, and kits and methods for altering the color of keratinous fibers such as hair.

Abstract: The present invention relates to a composition for keratin fibers comprising: (a) at least one non-neutralized anionic surfactant; (b) at least one non-ionic surfactant; (c) at least one fatty alcohol; and (d) at least one alkaline agent, wherein the composition does not comprise more than 2% by weight of a phosphoric surfactant. The present invention can provide the composition for keratin fibers which can suppress its ammonium odor and have improved stability.

Abstract: The instant disclosure relates to hair coloring base compositions and developer compositions that can be incorporated into a hair color cartridge, which combines the compositions and dispenses them onto hair. The hair color cartridge includes: (a) one or more hair coloring base compositions and; (b) one or more developer compositions, which can be combined to form an active hair coloring composition and dispensed onto hair. The hair coloring base compositions typically include one or more oxidative dye precursors; one or more alkalizing agents; one or more reducing agents; optionally, one or more cationic conditioning polymers; one or more surfactants; one or more water-soluble solvents; and water. The developer compositions typically include one or more oxidizing agents; one or more surfactants; and water.

Abstract: The present invention relates to a kit, preferably for coloring keratin fibers, the kit comprising in spatially separated form at least two kit components: A) a first kit component comprising at least these constituents: at least one alkaline agent; at least one amino acid; at least one organic phosphate ester compound selected from the group consisting of a monoester of a phosphate of one or more alkoxylated fatty alcohols, a diester of a phosphate of one or more non-alkoxylated fatty alcohols, and a mixture of both; water; and optionally at least an oxidative dye; water; and B) a second kit component comprising at least these constituents: at least one emulsifier; hydrogen peroxide; at least one fatty alcohol; and water.

Abstract: The present invention relates to a process for dyeing keratin fibers, in particular human keratin fibers such as the hair, using a) one or more blue, violet or green dyes and b) one or more disulfide, thiol or protected-thiol fluorescent dyes. The present invention also relates to a cosmetic composition comprising the dyes defined above, and also to a multi-compartment device containing said dyes. The present invention also relates to the use of said dyes for dyeing light keratin fibers, notably human keratin fibers such as the hair, in chestnut-brown, dark chestnut-brown, brown, brown with a tint, or even black, without using an additional dye other than those defined above.

Abstract: The present invention relates to a composition for treating keratin materials, in particular keratin fibres, and in particular human keratin fibres such as the hair, comprising, in a cosmetically acceptable medium: at least one fatty substance in a content of greater than or equal to 10% by weight relative to the total weight of the composition, at least one oxyalkylenated (OA), preferably oxyethylenated (OE), nonionic surfactant comprising a number of OA units, preferably OE units, ranging from 1 to 9, at least one oxyalkylenated (OA), preferably oxyethylenated (OE), nonionic surfactant comprising at least 10 OA units, preferably OE units, the weight ratio of the amount of oxyalkylenated (OA), preferably oxyethylenated, nonionic surfactant(s) comprising a number of OA units, preferably OE units, ranging from 1 to 9 to the amount of oxyalkylenated (OA), preferably oxyethylenated, nonionic surfactants comprising at least 10 OA units, preferably OE units, being greater than 1, at least one chemical oxidizing ag

Abstract: Cosmetic agents for the temporary color change of keratinous surfaces, in particular human hair and human skin, contain an alcohol having 2 to 8 carbon atoms, a special anionic polymer, and a pigment. These cosmetic agents have an extremely good water resistance but can be removed without residue with a single application of surfactant-containing detergents. In addition, methods of temporary staining keratinous fibers and the skin using these agents are provided.

Abstract: The disclosure relates to compositions and methods for removing direct dyes from hair, the methods comprising contacting hair with a composition comprising (i) at least one organic salt selected from imidazolium-based compounds and/or ammonium-based compounds, and (ii) at least one surfactant. The compositions can further contain at least one co-surfactant and/or cyclic compound.

Abstract: Provided are methods of treating hair, the method comprising: contacting the hair with a mixture comprising: i. an ionic liquid comprising an imidazolium-based compound or ammonium-based compound, and ii. an anionic surfactant. In certain methods, the mixture further comprises a cationic direct dye.

Abstract: The disclosure relates to compositions and methods for removing direct dyes from hair, the methods comprising contacting hair with a composition comprising at least one organic salt selected from imidazolium-based compounds and/or ammonium-based compounds.

Abstract: The present invention relates to a process for dyeing and/or lightening keratin fibres, in particular human keratin fibres such as the hair, using b) one or more disulfide, thiol or protected-thiol fluorescent direct dyes and a) one or more direct dyes different from b). The present invention also relates to a cosmetic composition comprising the dyes defined above, and also to a multi-compartment device containing said dyes. The present invention also relates to the use of the dyes a) and b) for dyeing light or dark keratin fibres, without using an additional dye different from those defined above, for giving the fibres very chromatic, particularly visible colours.

Abstract: The present invention relates to an anhydrous solid composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a particular chemical oxidizing agent and a polymer comprising at least one heterocyclic vinyl monomer. The present invention also relates to a packaging article containing said composition. The present invention also relates to processes for dyeing keratin fibres using said composition or said packaging article. Finally, the present invention relates to the use of said composition or of said packaging article for dyeing keratin fibres, and in particular human keratin fibres such as the hair.

Abstract: The present invention relates to the use of one or more particular dihydroisoquinolinium salts of formula (I) for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium salts and one or more chemical oxidizing agents. The present invention also relates to one or more particular dihydroisoquinolinium salts and also to compositions containing them, in particular compositions comprising a physiologically acceptable medium.

Abstract: The present invention relates to a composition for surface modification. The composition for surface modification according to the present invention contains a particular carbodiimide-based compound, thus forms a covalent bond without damaging skin, hair, or fabric, and semipermanently provides desired skin or hair surface modification effects or fabric care effects.

Abstract: Dye composition comprising 12-hydroxystearic acid, an organic amine and a dye The invention relates to a dye composition comprising 12-hydroxystearic acid, one or more organic amines and one or more dyes chosen from oxidation dyes and direct dyes. The invention also relates to a dyeing process using said dye composition.

Abstract: The present application relates to agents for dyeing keratin fibers, in particular human hair, exemplified in that said agents are produced by mixing (A) one or more oxidation dye precursors in salt form and (B) one or more water-soluble salts of barium and/or of calcium, wherein the molar ratio of all oxidation dye precursors in salt form (A) used in the agent to all water-soluble barium and calcium salts (B) used in the agent. i.e. the molar ratio (A)/(B), lies at a value of from about 1.0 to about 1.4.

Abstract: Encapsulated perfume composition comprising at least one aminoplast core-shell microcapsule dispersed in a suspending medium, the microcapsule comprising a perfume-containing core encapsulated in a shell, said shell comprising a network of cross-linked aminoplast resin, wherein 75-100% of the resin comprises 50-90%, preferably from 60-85%, of a terpolymer and from 10-50%, preferably from 10-25%, of a polymeric stabilizer; the terpolymer comprising: (a) from 20-35 wt %, preferably 22-30% by weight of moieties derived from at least one triamine, (b) from 30-60 wt %, preferably 40-55% by weight of moieties derived from at least one diamine, (c) from 20-35 wt %, preferably 22-30% by weight of moieties derived from the group consisting of alkylene and alkylenoxy moieties having 1 to 6 methylene units, preferably 1 to 4 methylene units and most preferably 1 methylene unit.

Abstract: The present disclosure relates to a liquid agent and/or hair dye for oxidative coloring of keratinous fibers with improved color performance and nourishing effect. In an embodiment, the agent comprises, in a hydrous cosmetic carrier: (a) a fatty acid which is liquid at 20° C. and has about 16-22 carbon atoms in an amount of about 0.1-15 wt. %, (b) an alkanolamine as an alkalizing agent, selected from monoethanolamine, 2-amino-2-methylpropanol and triethanolamine, in an amount such that at least one part of the fatty acid is present as soap, (c) an oil component different from (a) in an amount of about 0.05-5 wt. %, (d) an alkylamidoamine in an amount of about 0.05-6 wt. %, and (e) an oxidation dye precursor. The agent does not contain any branched fatty alcohols having about 7 or more carbon atoms, and does not contain any fatty alcohols having a melting point of about 25° C. or higher.

Abstract: A subject-matter of the invention is a process for dyeing keratinous substances, in particular keratinous fibers, comprising the application, to the said keratinous fibers: of at least one composition A comprising at least one non-ionic alkylpolyglucoside surfactant, at least one metal salt and at least one thickening polymer and of at least one composition B comprising one or more ortho-diphenol derivative(s).

Abstract: The present disclosure relates to compositions and methods for improving the quality and durability of color in artificially colored hair. The compositions are hair coloring compositions that employ divalent metal salts of inorganic acids, monovalent or divalent metal salts of organic acids and colorants. Methods are described wherein hair is contacted with the compositions of the present disclosure, resulting in improved artificial color deposition, as well as improved quality and durability of the color in artificially colored hair.

Abstract: The present disclosure relates to hair coloring agents and compositions, and methods for improving the quality and durability of color in artificially colored hair. The compositions employ divalent metal salts of inorganic acids, monovalent or divalent metal salts of organic acids, antioxidants, and colorants. Methods are described wherein hair is contacted with the compositions of the present disclosure, resulting in improved artificial color deposition, as well as improved quality and durability of the color in artificially colored hair.

Abstract: The present disclosure concerns a multi-component packing unit (kit of parts) for reshaping and coloring keratinous fibers, more particularly human hair, comprising at least two separately packaged preparations (A) and (B), the first preparation (A) comprising, in a cosmetic vehicle (A1), one or more resorcinol derivatives from the group consisting of resorcinol, 2-methylresorcinol and 4-chlororesorcinol, and (A2) one or more oxidation dye precursors from the group consisting of p-phenylenediamines, p-aminophenols, 2,4,5,6-tetraaminopyrimidines and 4,5-diaminopyrazoles, and the second preparation (B) comprising, in a cosmetic vehicle (B1), hydrogen peroxide, wherein the molar ratio of all resorcinol derivatives (A1) in the preparation (A) to all developer-type oxidation dyes (A2) in the preparation (A), i.e. the molar ratio (A1)/(A2), is at least about 1.2.

Abstract: A method for reducing skin staining during the coloring of hair includes the following steps in the indicated sequence: A1) applying a coloring agent (F) to the hair, A2) allowing the coloring agent (F) to act for a time period from 30 seconds to 45 minutes, B1) applying an undiluted cleaning agent (R) to skin areas that can come into contact with the coloring agent (F) when the latter is washed out, C1) jointly washing out the coloring agent (F) and cleaning agent (R), wherein the coloring agent (F) includes at least one oxidation dye precursor and/or at least one direct dye and the cleaning agent (R) includes at least one anionic surfactant. A multicomponent packaging unit includes the coloring agent (F) and the cleaning agent (R).

Abstract: A hair dye composition containing a carbonate also includes (A) at least one selected from resorcin and its derivatives, and salts thereof, an upper limit of a compounding amount of the component (A) being 0.2% by mass or less, and (B) at least one dye selected from 5-(2-hydroxyethylamino)-2-methylphenol, 1,5-dihydroxynaphthalene, and a nitro dye.

Abstract: The present invention relates to carbon-based fluorescent nano-agent tracers for analysis of oil reservoirs. The carbon-based fluorescent nano-agents may be used in the analysis of the porosity of a formation. The nanoagents are suitable for injection into a petroleum reservoir and may be recovered from the reservoir for the determination of hydrocarbon flow rates and retention times.

Abstract: The invention relates to a method for dyeing keratin fibers, in particular human hair, in which alter applying and allowing a thickened pre-treatment agent in the form of a lightening or bleaching agent (M1), comprising at least one oxidation agent, to react, a dye (M2) is applied directly and is allowed to react without rinsing. By carrying out said method, hair can be colored in a dyeing step and simultaneously multi-tonal dyeing with highlights is achieved.

Abstract: The present invention relates to carbon-based fluorescent nano-agent tracers for analysis of oil reservoirs. The carbon-based fluorescent nano-agents may be used in the analysis of the porosity of a formation. The nanoagents are suitable for injection into a petroleum reservoir and may be recovered from the reservoir for the determination of hydrocarbon flow rates and retention times.

Abstract: A multi-component packaging unit (kit of parts) for oxidatively coloring keratin fibers, including two preparations (A) and (B) packaged separate from each other. Preparation (A) includes, in a cosmetic carrier, (a1) at least one oxidation dye precursor and (a2) ammonia, and preparation (B) includes, in a cosmetic carrier, (b1) hydrogen peroxide, (b2) at least one fatty alcohol from the group comprising arachidyl alcohol (eicosan-1-ol), gadoleyl alcohol ((9Z)-eicos-9-en-1-ol), arachidonyl alcohol ((5Z,8Z,11Z,14Z)-eicosa-5,8,11,14-tetraen-1-ol), heneicosyl alcohol (heneicosan-1-ol), behenyl alcohol (docosan-1-ol), erucyl alcohol ((13Z)-docos-13-en-1-ol), and/or brassidyl alcohol ((13E)-docosen-1-ol), and (b3) at least one hydrocarbon having 8 to 80 C atoms.

Abstract: Described herein is a method of dyeing the hair. The method includes applying to the hair a hair color composition including one or more direct dye compounds and rinsing the hair with water. The one or more direct dye compounds each include a blue-violet or blue chromophore, one or two permanent cations, one to four incipient cations, and one or more hydrophobic moieties. The incipient cations are pendant to the core structure and are neutral. The direct dye compounds enter the hair shaft after the hair color composition is applied to the hair. The hair color composition has a pH of from about 6 to about 11. The pH of the hair after rinsing is from about 3.5 to about 6. The rinsing of the hair causes one or more of the one to four incipient cations to change from neutral to positively charged inside of the hair shaft.

Abstract: An agent for coloring keratinic fibers, particularly human hairs, includes in a cosmetic carrier (a) at least one preservative from the group of sorbic acid, 2-hydroxydiphenyl, 4-hydroxybenzoic acid, dehydroacetic acid, dibromohexamidine, 10-undecylenic acid, hexetidine, triclocarban, triclosanum, 4-chloro-3,4-dimethylphenol, imidazolidinyl urea, hexamethylenetetramine, 1-(4-chlorophenoxy)-1-(imidazole-1-yl)-3,3-dimethyl-2-butanone, 1,3-Bis-(hydroxymethyl)-5,5-dimethyl-2,4-imidazolidinedione, 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2-pyridone, bromochlorophene, 3-methyl-4-(1-methylethyl)phenol, 5-chloro-2-methyl-3(2H)-isothiazolone, 2-benzyl-4-chlorophenol, 2-chloroacetamide, chlorohexidine, 4,4-dimethyl-1,3-oxazolidine, 1-phenoxy-propane-2-ol, hexamidine, 5-ethyl-1-aza-3,7-dioxabicyclo-[3.3.

Abstract: Disclosed are compositions for dyeing keratin fibers comprising at least one direct dye and/or an oxidative dye and optionally an activator, and also comprising a compound formed by esterification of phosphoric acid with isooctanol (2-ethylhexanol) and ethoxylated tridecylic alcohol.

Abstract: The present invention relates especially to a composition for dyeing keratin fibers, in particular human keratin fibers such as the hair, comprising: (i) one or more fatty substances in a content ranging from 40% to 85% by weight relative to the total weight of the dye composition, (ii) one or more oxyethylenated fatty alcohols with an oxyethylene number of less than or equal to 10, and (iii) one or more nonionic surfactants of alkylpolyglucoside type, (iv) optionally one or more alkaline agents, (v) one or more direct dyes which are preferably cationic, anionic or neutral. The present invention also relates to a process for dyeing keratin fibers, comprising the application to the said fibers of an above mentioned composition, optionally in the presence of a composition comprising one or more chemical oxidizing agents; the dye composition possibly resulting from the mixing of several compositions. Finally, the invention relates to devices that are suitable for performing this process.

Abstract: A method for dyeing keratinous fibers, in particular, human hair, in which, after a thickened pre-treatment agent (M1) containing no oxidation dye precursors has been applied and allowed to react, a coloring agent (M2) is applied and allowed to react immediately thereafter and without rinsing. By carrying out said method, hair can be colored in a dyeing step and simultaneously multi-tonal dyeing with highlights or lowlights can be achieved.

Abstract: Described herein is a method of dyeing the hair. The method includes applying to the hair a hair color composition including one or more direct dye compounds and rinsing the hair with water. The one or more direct dye compounds each include a yellow chromophore, one or two permanent cations, one to four incipient cations, and one or more hydrophobic moieties. The incipient cations are pendant to the core structure and are neutral. The one or more direct dye compounds enter the hair shaft after the hair color composition is applied to the hair. The hair color composition has a pH of from about 7 to about 11. The pH of the hair after rinsing is from about 3.5 to about 6. The rinsing of the hair causes one or more of the one to four incipient cations to change from neutral to positively charged inside of the hair shaft.

Abstract: A method for the oxidative dyeing of keratinic fibers includes the following steps: applying a cosmetic agent (M1) to the keratinic fibers, allowing agent (M1) to act on the keratinic fibers for a time period of 30 seconds to 40 minutes at a temperature of at least 25° C., applying a cosmetic agent (M2) to the keratinic fibers treated with cosmetic agent (M1), allowing cosmetic agents (M1) and (M2) to act on the keratinic fibers for a time period of 1 to 70 minutes, and rinsing out of cosmetic agents (M1) and (M2). Cosmetic agent (M1) includes at least one oxidation dye precursor of the developer type (M1-1), at least one oxidation dye precursor of the coupler type (M1-2), at least one direct dye (M1-3), and at least one surfactant (M1-4). Cosmetic agent (M2) includes at least one oxidation dye precursor (M2-1) and at least one oxidizing agent (M2-2).

Abstract: The present invention provides a two-part hair cosmetic material having a reduced irritating smell due to ammonia. Specifically, the present invention relates to a two-part hair cosmetic material comprising a first agent containing an alkali agent and a second agent containing an oxidizing agent, wherein the first agent contains the following ingredients: (A) a polyoxyethylene alkyl ether having a polyoxyethylene chain length of 50 or more, (B) a higher alcohol, and (C) a polyoxyethylene alkyl ether having a polyoxyethylene chain length shorter than the polyoxyethylene chain length of the polyoxyethylene alkyl ether (A), and the content of a higher alcohol having 20 or more carbon atoms in the higher alcohol (B) is 1.0% by weight or less based on the weight of the first agent.

Abstract: The present invention therefore relates in particular to an aqueous cosmetic composition comprising one or more fatty substances in a content ranging from 40% to 80% by weight, relative to the total weight of the cosmetic composition, one or more oxyethylenated fatty alcohols having a number of oxyethylenes less than or equal to 10, one or more alkylpolyglucoside-type surfactants; the present invention also relates to using the cosmetic composition in an oxidative coloring or bleaching method for keratin fibers, particularly human keratin fibers such as hair.

Abstract: Described herein is a hair color composition for dyeing the hair. The hair color composition includes one or more direct dye compounds and one or more additional ingredients. The one or more direct dye compounds each include a chromophore, one or two permanent cations, one to four incipient cations, and one or more hydrophobic moieties. The incipient cations are pendant to the core structure and are neutral. The one or more direct dye compounds enter the hair shaft after the hair color composition is applied to the hair. The hair color composition has a pH of from about 7 to about 11.

Abstract: The invention relates to a process for dyeing and/or lightening keratin fibers using i) particular dye(s) and/or pigment(s), ii) photoactive compound(s) and iii) light source(s); a cosmetic composition comprising the ingredients i) and ii); the use of ii) for improving the fastness and/or dyeing and/or lightening of keratin materials in the presence of the ingredients i) and iii) of light source(s), and a multi-compartment device comprising i), ii) and iii). The implementation process and the use i) of particular dye(s) and/or pigment(s) combined with ii) the photoactive compounds and iii) with a light source make it possible especially to obtain lasting coloration on keratin fibers without the use of a reducing agent, and without odor.

Abstract: The present invention relates to carbon-based fluorescent nano-agent tracers for analysis of oil reservoirs. The carbon-based fluorescent nano-agents may be used in the analysis of the porosity of a formation. The nanoagents are suitable for injection into a petroleum reservoir and may be recovered from the reservoir for the determination of hydrocarbon flow rates and retention times.

Abstract: Disclosed and claimed herein are a composition and a kit for coloring keratin fibers, and processes of their use. The composition includes a catechol-based color precursor.

Abstract: The present invention relates to carbon-based fluorescent nano-agent tracers for analysis of oil reservoirs. The carbon-based fluorescent nano-agents may be used in the analysis of the porosity of a formation. The nanoagents are suitable for injection into a petroleum reservoir and may be recovered from the reservoir for the determination of hydrocarbon flow rates and retention times.

Abstract: Disclosed is a hair conditioning composition comprising: a cationic surfactant system comprising a mono-long alkyl cationic surfactant and a di-long alkyl cationic surfactant; a high melting point fatty compound; a direct dye; a nonionic thickening polymer having a viscosity of the aqueous solution with 2% of the nonionic thickening polymer being from about 1,000 to about 300,000 m·Pa, at 25° C.; and an aqueous carrier; wherein the composition has a pH of above 4.5 to about 9.0. The composition of the present invention provides improved product stability and color stability, while providing conditioning benefits and coloring benefits.

Abstract: The present invention relates to a composition for dyeing keratin fibers, comprising:—one or more fatty substances,—one or more surfactants;—one or more oxidation bases,—one or more phenol-derived couplers corresponding to the formula (B2) below: * R1, R3, R5, represent a hydrogen; an optionally substituted C1-C8 alkyl or alkenyl radical; —SR or —OR; a saturated C5-C7 cyclic group; a (C1-C4)alkylcarbonyl group; hydrocarbonyl; a sulphonic or carboxylic acid group; * at least one of the radicals R1, R3, R5 representing a hydrogen atom; * R2, R4 represent a hydrogen; an optionally substituted C1-C8 alkyl or alkenyl; —SR; a (C1-C4)alkyl-carbonyl; hydrocarbonyl; a sulphonic or carboxylic acid group; * two groups chosen from R1, R2, R3, R4, R5 and borne by adjacent carbon atoms may form, together with said carbon atoms, a ring or a heterocycle with a single heteroatom, this ring or heterocycle comprising no double bond other than that of the ring to which it is fused; * at least one of the radicals R1, R2, R3, R4,

Abstract: The present invention relates to a process for dyeing keratin fibers, in particular human keratin fibers such as the hair, comprising the use of one or more metal catalysts chosen from transition metal salts and rare-earth metal salts, and mixtures thereof and a composition (I) comprising at least 10% by weight of one or more fatty substances different from fatty acids, one or more oxidation dyes and one or more oxidizing agents.