A catalyst composition resulting in increased propylene yields during fluid catalytic cracking processes comprises Y zeolite, ZSM-5 zeolite, and Beta zeolite. The object of the present invention is an aqueous hair colouring composition comprising at least one oxidative dye precursor, optionally at least one coupling agent, and an alkyl methicone. This method is particularly suitable for kitchen applications like the control of liquid and odor in refrigerators.