The present invention relates to a two part aqueous oxidative colouring composition for keratin fibres especially human hair with improved and homogeneous conditioning effect from root to tip, improved colour fastness against washing and for achieving homogeneous even colouration. Present invention is on a two part aqueous composition for colouring keratin fibres especially human hair, characterised in that the first part A is an aqueous composition and comprises at least one oxidative dye precursor, optionally at least one coupling agent and/or at least one direct dye and furthermore comprising at least one anionic surfactant the second part Part B is an aqueous composition and comprises at least one oxidizing agent and at least one cationic polymer.
