The present invention relates to the field of dyeing keratin fibres and more particularly to the field of hair dyeing. The present invention relates to a process for the oxidation dyeing of keratin fibres, in particular human keratin fibres such as the hair, which consists in using on the said fibres i) a substrate comprising on its surface one or more oxidation dyes, and ii) an aqueous composition comprising one or more oxidizing agents. The present invention also relates to a process for preparing the said substrate thus pretreated.
