Developer 20 Volume ( 6%) - For Temporary hair color Moderate developer 30 volume ( 9%) - For Permanent hair color Strong Developer 40 volume ( 12%) ? For hair Lighteners STEP 1: Put on a hairdresser?s cape and plastic gloves to avoid staining your hands and clothes. Choose your developer for your hair color preference. STEP 2: Mix developer with hair color with corresponding hair developer properly in a plastic or ceramic bowl. STEP 3: Apply the mixture evenly on your hair as desired. Decide whether you want to dye all your hair or highlight only a few sections. Part your hair and apply the color mixture accordingly. STEP 4: Rinse off after half an hour. CAUTION: Do not use metal bowl for mixing purpose. Always wear hand plastic gloves to avoid staining on hands and clothes. Strong Developer 40 volume ( 12%) ? For hair Lighteners