Abstract "Process for the keratin fiber oxidation dye and multi-compartment device" The object of the present invention is a process for the oxidation dye of keratin fibers, in particular human keratin fibers such as hair, which implements (a) a the step of treating said fibers by applying to said fibers a cosmetic composition (a) comprising (i) at least one grease in an amount greater than 10% by weight relative to the total weight of the composition (a) by least one metal catalyst； (ii) at least one coupler； (iii) optionally at least one oxidation base preferably selected from paraphenylenediamines, bis (phenyl) alkylenediamines, para-aminophenols, orthoaminophenols, heterocyclic bases, their addition salts and solvates； (b) optionally a washing, rinsing, drying and / or friction step； (c) a treatment step by applying to said fibers an oxidizing cosmetic composition (b) comprising at least one chemical oxidizing agent； and it should be clear that steps (a), (b) and (c) can be performed successively (a), then (b), then (c), or (a) after (c), followed by (b ). The dyeing process significantly improves the dyeing properties of the color, particularly in terms of selectivity, chromaticity, and color intensity and absorption. The use of a composition that is rich in fatty substances, ie more than 10%, and contains at least one catalyst, as a pretreatment, prior to oxidation dyeing, allows a marked improvement in dyeing properties, in particular in terms of dye absorption in keratin fibers, strength and chromaticity and color selectivity.resumo “processo para a tintura de oxidação de fibras queratínicas e dispositivo com compartimentos múltiplos” o objeto da presente invenção é um processo para a tintura de oxidação de fibras queratínicas, em particular fibras queratínicas humanas tais como o cabelo, que implementa (a) uma etapa de tratamento das referidas fibras pela aplicação sobre as referidas fibras de uma composição cosmética (a) que compreende (i) pelo menos uma s
