Check the listing for details. REF Peroxides Hair Color Cream Developers 33.8oz PICK YOURS!. Condition: New with box. Listed at 21.99 USD. Developers available in 5 different volumes and can be used for Permanent Colours, Soft Colours and all Blonde.ID Bleaches. We recommend all colours, as well as Blonde.ID Bleach, to be mixed in a non-metallic bowl with a REF Cream Developer, using a non-metal whisk for smooth results. As with any colour, mix in a well-ventilated area. The processing time and mixing ratio will depend on product, hair colour, porosity and condition of the hair. It will also depend on the technique used, the volume of hydrogen peroxide and how many levels will be lifted. How To ApplyOur Cream Developer with Peroxide 10 VOL/3% is perfect for the same level colour service, deeper/darker deposit colour or toning. Delivers 100% deposit and up to 1 level of lift.