PROCÉDÉ DE TEINTURE PAR OXYDATION À L'AIDE D'UNE COMPOSITION RICHE EN SUBSTANCES GRASSES QUI CONTIENT DES CATALYSEURS MÉTALLIQUES ET DES AGENTS DE COUPLAGE
The subject of the present invention is a process for the oxidation dyeing of keratin fibres, in particular human keratin fibres such as the hair, implementing: a) a step of treating said fibres by application to said fibres of a cosmetic composition (A) comprising: i) at least one fatty substance in an amount of greater than 10% by weight relative to the total weight of the composition (A), at least one metal catalyst； ii) at least one coupler； iii) optionally at least one oxidation base, preferably chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols, heterocyclic bases, addition salts thereof and solvates thereof； b) optionally a washing, rinsing, drying and/or rubbing-dry step； c) a step of treatment by application to said fibres of an oxidizing cosmetic composition (B) comprising at least one chemical oxidizing agent； and it being understood that steps a), b) and c) can be carried out successively a), then b), then c), or else a) then c), followed by b). The dyeing process makes it possible to significantly improve the dyeing properties of the colouration, in particular in terms of selectivity, of chromaticity, and of colour intensity and uptake. The use of a composition which is rich in fatty substances, i.e. greater than 10%, and contains at least one catalyst, as a pretreatment, before oxidation dyeing, allows a clear improvement in the dyeing properties, in particular in terms of dye uptake onto keratin fibres, of strength and of chromaticity and of selectivity of the colour.La présente invention concerne un procédé pour la teinture par oxydation de fibres kératiniques, en particulier de fibres kératiniques humaines telles que les cheveux, mettant en œuvre : a) une étape de traitements desdites fibres par application sur lesdites fibres d'une composition cosmétique (A) comprenant : i) au moins une substance grasse en une quantité supérieure à 10 % en poids par rapport au poids total de la composition (A), au
