V2 hair developer

Gentle V2 hair developer Usage: the proportion of Color Cream and peroxide cream is 1:1 (Because of various texture of hair, the time following is just for reference) 3% (10 VOL): Turn the white hair into black, from the lighter color to darker, or make the bottom color, the same class color returning effect. It costs around 20-25 minutes. 6%(20 VOL): It can make the color lighter for one class, it takes 25-35 minutes 9%(30VOL): It can make the color lighter for two classes, it takes 35-45 minutes 12%(40VOL): It can make the color lighter for 3 classes, it takes 45-50 minutes