The invention relates to a compound chosen from the compounds of formula (I) below, the optical and geometrical isomers thereof and the tautomers thereof, and also the addition salts thereof with an acid or a base, and the solvates thereof: (I). The invention also relates to the use of these particular compounds and the compositions for dyeing keratin fibers. ##STR00001##

A powder hair dye composition, containing the following components (A) to (C): (A) one or more azo dyes selected from the group consisting of the following (A-1), (A-2) and (A-3), (B) an alkaline agent other than alkanolamines, and (C) 1.5 mass % or more and 40 mass % or less of solvent. ##STR00001##

The present invention relates to a composition for dyeing. The composition for dyeing according to the present invention forms a covalent bond without damaging skin, hair, nails, fibers, or leather by using a reaction promoting additive for promoting peptide bond formation in addition to a carbodiimide-based compound, thereby providing a desired semi-permanent dyeing effect.

A cosmetic composition includes a non-acid-resistant-grade ultramarine dye, a stabilizing agent, at least one additive, and water. The ultramarine dye may be present at a concentration of about 0.1% to about 0.4%, by weight, of the cosmetic composition and may include a trisulfur radical anion. The stabilizing agent may include baicalin and may be at a concentration of about 0.2% or less, by weight, of the cosmetic composition. The cosmetic composition may have a pH in the range of 6.5 to 8.0. A method of stabilizing a cosmetic composition includes forming a cosmetic composition including a non-acid-resistant-grade ultramarine dye, a stabilizing agent, at least one additive, and water. The method also includes adjusting a pH of the cosmetic composition to a predetermined value. The stabilizing agent inhibits degradation of the ultramarine dye, thereby stabilizing the cosmetic composition and inhibiting generation of an odor caused by degradation of the ultramarine dye.

An agent for dyeing keratinous material (e.g. human hair) is disclosed. The agent comprises at least one amino-functionalized silicone polymer; at least one color-imparting compound; and at least one addition product of C.sub.1-C.sub.6 alkylene oxide(s) to the esters of C.sub.12-C.sub.30 fatty acids and C.sub.1-C.sub.12 aromatic alcohols. A method for dyeing keratinous material is also disclosed, and comprises applying the agent to keratinous material, exposing the agent to the keratinous material, and rinsing the keratinous material to remove the agent.

The present disclosure relates to compositions for altering the tone or color of the hair, the compositions comprising at least one amino acid, at least one carboxylic acid, monoethanolamine, and at least one hair coloring agent. The disclosure also relates to methods of using the compositions.

Disclosed are hair-colouring compositions comprising an oxidative dye and an alkalising agent consisting of isopropanolamine and a malic acid diester. The compositions according to the invention, due to synergic effects between isopropanolamine and the malic acid diester, are advantageous, because they lighten the hair by up to four levels, do not have an unpleasant odour, and limit the damage caused to the hair, maintaining its integrity and consequently its natural characteristics of elasticity, shine and combability.

The present invention relates to a composition for dyeing keratin fibres comprising, in a cosmetically acceptable medium of acidic pH, the pH of which is preferably less than 5, one or more direct dyes of triarylmethane structure, which are preferably cationic. The invention also relates to a process for dyeing keratin fibres using said composition and also to a use for dyeing keratin fibres.

The present invention relates to a method of coloring keratin fibers, especially human hair, which delivers intensive, long lasting, brilliant colors and provides improved grey coverage. Kit therefore is disclosed as well. The method of colouring hair involves treating hair prior to colouring with an alkaline reducing agent.

An oil-based hair coloring cosmetic which contains 3 to 40% by mass of a solid oil having a melting point of 50° C. to 120° C. (A-1) and/or a lipophilic gelling agent (A-2), 1 to 15% by mass of an oil-soluble resin (B), 5 to 60% by mass of a volatile oil (C), 0.1 to 10% by mass of a nonionic surfactant having an HLB value of 5 to 11 (D), 3 to 70% by mass of a powder consisting of a coloring pigment and an extender pigment optionally used in combination with the coloring pigment (E), and 0 to 10% by mass of a non-volatile oil (F), wherein a ratio by mass of the component (F) to the component (B)[(F)/(B)] is 1 or less. This oil-based hair coloring agent has excellent water resistance and color transfer resistance, while being easily removed by shampooing.