Abstract: The present invention relates to direct dyes of azomethine type of formula (I) below; and also to the use thereof for dyeing keratin fibres, in particular human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres, comprising such direct dyes in a suitable dyeing medium. Similarly, a subject of the invention is a process for dyeing keratin fibres using the said dye composition, and also a device comprising the same. Finally, the present invention also relates to precursors of these direct dyes.

Abstract: The present invention relates to quinone direct dyes of formula (I) below, organic or mineral acid or base salts thereof, tautomeric forms, optical isomers or geometrical isomers thereof and/or solvates thereof: and also to the use thereof for dyeing keratin fibres, in particular human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres, comprising such direct dyes in a suitable dyeing medium. Similarly, a subject of the present invention is a process for dyeing keratin fibres, using the said dye composition.

Abstract: The invention relates to a composition for dyeing keratin materials, and in particular human keratin fibres such as the hair, comprising at least one 2-pyrrolidone functionalized in the 4 position with an ester or amide radical, and at least one hydrophobic direct dye or a pigment; a dyeing process using this composition. Similarly, the invention relates to the use of the said pyrrolidone combined with a direct dye or a pigment for dyeing keratin materials, and especially to the use of the said pyrrolidone for improving the colour uptake onto the fibres of direct dyes that are sparingly soluble or insoluble in aqueous-alcoholic supports. The invention also relates to novel pyrrolidone derivatives. The present invention makes it possible in particular to obtain direct dyeing on keratin materials that is fast, resistant to washing, chromatic and powerful.

Abstract: A subject-matter of the invention is a composition comprising a) at least one ortho-diphenol derivative, b) at least one specific metal derivative and c) at least one basifying agent, a method for dyeing keratinous fibers by treatment of the said fibers using the ingredients a), b) et c) and the use thereof for dyeing keratinous fibers. This hair dyeing method makes it possible to obtain better colorations which are more uniform, chromatic and lasting and which do not detrimentally affect the cosmetic properties of the keratinous fibers, starting from an extract of ortho-diphenols which are in particular natural.

Abstract: The invention relates to a composition for dyeing keratin fibers, and in particular human keratin fibers such as the hair, comprising at least one 2-pyrrolidone functionalized in the 4 position with a carboxylic acid or amide radical, and at least one hydrophobic direct dye or a pigment; a dyeing process using this composition. Similarly, the invention relates to the use of the said pyrrolidone combined with a direct dye or a pigment for dyeing keratin fibers, and especially to the use of the said pyrrolidone for improving the color uptake onto the fibers of direct dyes that are sparingly soluble or insoluble in aqueous-alcoholic supports. The invention also relates to novel pyrrolidone derivatives. The present invention makes it possible in particular to obtain direct dyeing on keratin fibers that is fast, resistant to washing, chromatic and powerful.

Abstract: The subject of the invention is a composition for dyeing keratin fibers, comprising at least one 1,8-dihydroxynaphthalene derivative and at least one basifying agent other than aqueous ammonia; the use of the composition for hair dyeing and also the use of the composition in a dyeing process for keratin fibers. The composition according to the invention makes it possible to dye keratin fibers under mild oxidizing conditions even without using an oxidation base and an aromatic amine, while at the same time covering a broad color range with 1,8-dihydroxynaphthalene derivatives. The observed dyeing under oxidizing conditions operates under mild conditions of oxidation and/or basifying agent, in particular in the air, and does not produce any unpleasant odor.

Abstract: The invention relates to a composition for dyeing keratin fibres, and in particular human keratin fibres such as the hair, comprising at least one 2-pyrrolidone functionalized in the 4 position with a carboxylic acid or amide radical, and at least one hydrophobic direct dye or a pigment; a dyeing process using this composition. Similarly, the invention relates to the use of the said pyrrolidone combined with a direct dye or a pigment for dyeing keratin fibres, and especially to the use of the said pyrrolidone for improving the colour uptake onto the fibres of direct dyes that are sparingly soluble or insoluble in aqueous-alcoholic supports. The invention also relates to novel pyrrolidone derivatives. The present invention makes it possible in particular to obtain direct dyeing on keratin fibres that is fast, resistant to washing, chromatic and powerful.

Abstract: The invention relates to a composition for dyeing keratin materials, and in particular human keratin fibres such as the hair, comprising at least one 2-pyrrolidone functionalized in the 4 position with an ester or amide radical, and at least one hydrophobic direct dye or a pigment; a dyeing process using this composition. Similarly, the invention relates to the use of the said pyrrolidone combined with a direct dye or a pigment for dyeing keratin materials, and especially to the use of the said pyrrolidone for improving the colour uptake onto the fibres of direct dyes that are sparingly soluble or insoluble in aqueous-alcoholic supports. The invention also relates to novel pyrrolidone derivatives. The present invention makes it possible in particular to obtain direct dyeing on keratin materials that is fast, resistant to washing, chromatic and powerful.

Abstract: A subject-matter of the invention is a composition comprising a) at least one ortho-diphenol derivative, b) at least one specific metal derivative and c) at least one basifying agent, a method for dyeing keratinous fibres by treatment of the said fibres using the ingredients a), b) et c) and the use thereof for dyeing keratinous fibres. This hair dyeing method makes it possible to obtain better colorations which are more uniform, chromatic and lasting and which do not detrimentally affect the cosmetic properties of the keratinous fibres, starting from an extract of ortho-diphenols which are in particular natural.

Abstract: The invention relates to the dyeing of keratin fibers using azomethine direct dyes or reduced precursors of azomethine direct dyes of formula (I) and (II) obtained from 2-amino-3-hydroxypyridine. The invention relates to a dye composition comprising at least one azomethine direct dye or a reduced precursor of an azomethine direct dye, to a process for dyeing keratin fibers, using the said composition, and to their uses in the dyeing of keratin fibers. This composition allows a particularly stable and fast coloration to be obtained.

Abstract: The invention relates to the dyeing of keratinous fibres using azomethine direct dyes of formula (I) or reduced precursors of azomethine direct dyes of formula (II) obtained from 2-chloro-3-amino-6-methylphenol. A subject-matter of the invention is a dyeing composition comprising at least one chlorinated azomethine direct dye or one reduced precursor of a chlorinated azomethine direct dye, a method for dyeing keratinous fibres which employs the said composition and their uses in the dyeing of keratinous fibres. This composition makes it possible to obtain a particularly stable and consistent colouring.

Abstract: The invention relates to the dyeing of keratin fibres using azomethine direct dyes or precursors of azomethine dyes obtained from 2-alkylresorcinols. The invention relates to a dye composition comprising at least one azomethine direct dye or pre-cursor of an azomethine direct dye, to a process for dyeing keratin fibres, using the said composition, and to their uses in the dyeing of keratin fibres. This composition allows a particularly stable and fast coloration to be obtained.

Abstract: The invention relates to the dyeing of keratin fibres using azomethine direct dyes or reduced precursors of azomethine direct dyes of formula (I) and (II) obtained from 2-amino-3-hydroxypyridine. The invention relates to a dye composition comprising at least one azomethine direct dye or a reduced precursor of an azomethine direct dye, to a process for dyeing keratin fibres, using the said composition, and to their uses in the dyeing of keratin fibres. This composition allows a particularly stable and fast coloration to be obtained.

Abstract: The invention relates to the dyeing of keratinous fibres using azomethine direct dyes of formula (I) or reduced precursors of azomethine direct dyes of formula (II) obtained from 2-chloro-3-amino-6-methylphenol. A subject-matter of the invention is a dyeing composition comprising at least one chlorinated azomethine direct dye or one reduced precursor of a chlorinated azomethine direct dye, a method for dyeing keratinous fibres which employs the said composition and their uses in the dyeing of keratinous fibres. This composition makes it possible to obtain a particularly stable and consistent colouring.

Abstract: The invention relates to the dyeing of keratin fibres using azomethine direct dyes or precursors of azomethine dyes obtained from 2-alkylresorcinols. The invention relates to a dye composition comprising at least one azomethine direct dye or pre-cursor of an azomethine direct dye, to a process for dyeing keratin fibres, using the said composition, and to their uses in the dyeing of keratin fibres. This composition allows a particularly stable and fast coloration to be obtained.

Abstract: Disclosed herein is a composition for the dyeing of keratin fibers, for example, human keratin fibers such as the hair, comprising at least one 3-amino pyrazolo-[1,5-a]-pyridine derivative or one of its addition salts and a method employing this derivative. The composition of the present disclosure makes it possible to obtain coloration in various shades that is powerful, chromatic, and aesthetic, with low selectivity and with good resistance to various aggressive factors to which the hair may be subjected, such as shampoos, the light, sweat and permanent shaping.

Abstract: Disclosed herein is a composition for the dyeing of keratin fibers, for example, human keratin fibers such as the hair, comprising at least one 3-amino pyrazolo-[1,5-a]-pyridine derivative or one of its addition salts and a method employing this derivative. The composition of the present disclosure makes it possible to obtain coloration in various shades that is powerful, chromatic, and aesthetic, with low selectivity and with good resistance to various aggressive factors to which the hair may be subjected, such as shampoos, the light, sweat and permanent shaping.

Abstract: Disclosed herein is a composition for the dyeing of keratin fibers, for example, human keratin fibers such as the hair, comprising at least one 3-amino pyrazolo-[1,5-a]-pyridine derivative or one of its addition salts and a method employing this derivative. The composition of the present disclosure makes it possible to obtain coloration in various shades that is powerful, chromatic, and aesthetic, with low selectivity and with good resistance to various aggressive factors to which the hair may be subjected, such as shampoos, the light, sweat and permanent shaping.

Abstract: The present disclosure relates to novel N-alkylpolyhydroxylated secondary para-phenylenediamines, to processes for preparing them, to compositions for dyeing keratin fibers, for example keratin fibers such as the hair, comprising, in a medium that is suitable for dyeing, at least one such secondary para-phenylenediamine. The present disclosure also relates to processes for dyeing keratin fibers with the compositions according to the present disclosure, and to dyeing kits containing such compositions.

Abstract: The present disclosure relates to novel N-alkylhydroxylated secondary para-phenylenediamine compounds, to a composition for dyeing keratin fibers, for instance human keratin fibers such as the hair, comprising, in a medium that is suitable for dyeing, at least one ortho- and/or meta-substituted N-alkylhydroxylated secondary para-phenylenediamine, to a process for dyeing keratin fibers comprising applying this composition, and also a dyeing “kit.