The present invention relates to an aqueous oxidative colouring composition for keratin fibres especially human hair with improved conditioning effect, improved colour fastness against washing and for achieving homogeneous even colouration. The object of the present invention is an aqueous composition for colouring keratin fibres especially human hair, based on at least one oxidative dye precursor, optionally at least one coupling agent and/at least one direct dye and furthermore comprising in a cosmetically acceptable medium at least one anionic surfactant, at least one branched fatty acid and at least one quaternary ammonium surfactant.