Ducastel bleaching oil light bleaching oil, lighten up to 4 tons ideal for american shampoos manual: in a non-metallic container, mix 1 part bleaching oil for 2 parts of 20v or 30v oxidizer apply with a brush on unwashed dry hair and allow to stand for 15 to 40 minutes after the discoloration obtained then rinse thoroughly with clear water finish with a shampoo after discoloration capacity: 1000 ml.