The invention relates to a method for dyeing keratin fibres, in particular human hair, in which alter applying and allowing a thickened pre-treatment agent in the form of a lightening or bleaching agent (M1), comprising at least one oxidation agent, to react, a dye (M2) is applied directly and is allowed to react without rinsing. By carrying out said method, hair can be coloured in a dyeing step and simultaneously multi-tonal dyeing with highlights is achieved.
