Once the appropriate Kuul Permanent Hair Color and Developer have been selected, use a mixing ratio of 1:1?? (color:developer). In a non-metallic bowl measure 4.56 fl oz (135ml) of Kuul Cream Developer and add 3.04 fl oz (90ml) of Kuul Permanent Hair Color. Mix well. Apply on dry hair. Processing time: 45-60 minutes, depending on the application technique. Read the instructions that are found printed inside the Kuul Permanent Hair Color carton. Rinse only with water. Virgin hair: Apply mixture to ends and process for 20 minutes. Then apply to the root and process 30 more minutes. Rinse only with water. Touch up: Apply mixture to hair growth and process for 20 minutes. Then apply to rest of hair and process for 10 more minutes. Rinse only with water.