The invention relates to a process for dyeing keratin fibres, comprising the use of one or more metal catalysts and of a composition (A) comprising: &mdashone or more oxidizing agents, and &mdashat least one aminobenzimidazole oxidation base of formula (I) in which the radicals R1 to R5 represent, independently of each other, a hydrogen atom a halogen atom a C1-C6 alkyl radical a C1-C6 alkoxy radical a C1-C6 dialkylamino radical a carboxylic radical (&mdashCOOH) a sulfonic radical (&mdashS03H) a phenyl radical a sat orated or unsaturated 5- to 7-membered heterocyclic radical, comprising one or more heteroatoms chosen from N, O and S.
