Oxidation dyeing process implementing a pretreatment based on a composition rich in fatty substances and on metal catalysts

A process for the oxidation dyeing of keratin fibers, the process comprising:

• a) pretreating the fibers by applying to the fibers a first cosmetic composition comprising:
• i) at least one fatty substance chosen from fatty substances that are liquid at ambient temperature and at atmospheric pressure, liquid petroleum jelly, C6-C16 alkanes, polydecenes, liquid fatty acid esters, fatty alcohol esters, liquid fatty alcohols, or combinations thereof, wherein the total amount of fatty substance in the first composition is at least 35% by weight, relative to the total weight of the first composition;
• ii) at least one metal catalyst chosen from metal salts;
• metal oxides;
• metal complexes;
• complexes of transition metal salts and rare earth metal salts;
• compounds including manganese, iron, cobalt, copper, zinc, platinum, nickel, titanium, silver, zirconium, chromium, molybdenum, tungsten, gold, vanadium, or combinations thereof;
• inorganic metal salts, halides, carbonates, sulfates, phosphates, hydrated halides;
• organic acid salts of transition metals;
• organic salts of manganese;
• inorganic salts of rare earth metals;
• inorganic salts of cerium;
• organic acid metal salts chosen from citrates, lactates, glycolates, gluconates, acetates, propionates, fumarates, oxalates, tartrates;
• metal salts which possess a metal in oxidation state II and two (poly)hydroxy acid-derived ligands, metal salts that are complexed with two carboxylate groups, metal salts represented by formula (I):
• R—C(O)—O-M-O—C(O)—R′ (I)
• solvates thereof, hydrates thereof, enantiomers thereof, or combinations thereof,
• wherein in formula (I):
• M represents a metal (II) or metal2+ in oxidation state 2 or Mn2+, and
• R and R′, which may be identical or different, represent a (C1-C6)(poly)hydroxyalkyl group;
• and
• optionally at least one organic or inorganic basifying agent;
• b) performing an intermediate rinsing and rubbing dry step;
• and
• c) dyeing the fibers by application to the fibers of a ready-to-use cosmetic composition comprising:
• i) at least one oxidation base,
• ii) optionally at least one coupler;
• iii) at least one chemical oxidizing agent, and
• iv) at least one organic or inorganic basifying agent.

A multicompartment kit comprising:

• a first compartment containing a first composition comprising:
• at least one fatty substance in an amount of greater than or equal to about 10% by weight relative to the total weight of the first composition;
• and
• at least one metal catalyst;
• a second compartment containing a second composition comprising:
• at least one oxidation base;
• and
• optionally at least one coupler;
• and
• a third compartment containing a third composition comprising at least one chemical oxidizing agent.