Koleston Perfect professional hair colour sets the standard for quality, and creativity in hair colour worldwide. Provides full coverage for a glossy vibrant finish. Mixing ration: 1:1 (1 part colour + 2 parts colour developer) This is a professional colour product and it is essential to seek professional advice when mixing and applying permanent hair colour creme with peroxide to formulate the right mix and combination of ingredients, and to ensure it is the colour you’re wanting. The application and mix of professional colour requires the expertise of a salon professional. Please note that some colours are marked with a production and/or expiry date. Any date on the box is only suggestive.