Powder Powder should be used with 6,9 or 12 % Cream Cream. The recommended ratio is 1/3 powder and 2/3 cream cream. In a plastic box, mix ingredients. Put on your hair. The degree of brightening depends on the strength of the cream cream, as well as the condition of hair. Leave the centre on the hair to achieve the desired degree of brightening (20 to 45 minutes). Wash your hair with warm water.