40 Volume Developer Before And After. Developer comes in different strengths, or volumes, including 10, 20, 30, 40 and 50 which means: 10 volume = 3% peroxide. 20 volume = 6% peroxide. 30 volume = 9% peroxide.
The higher the volume of hydrogen peroxide, the faster it will lighten hair but it can also be more damaging. For this reason, it’s important to. The 9 volume can be used to darken highlighted or lightened hair up to 4 levels, covers up to 30 percent white hair and maintain same level. Any lightening process will damage your hair. Before and after 30 volume developer on dark hair if products are purchased separately, combine 1 ounce of 30 volume developer with 1 ounce of bleach powder. The short answer to this frequently asked question is yes if you are bleaching hair from light to dark. The only developer that can change your hair color significantly is a 40 volume developer found on amazon website. Familiarize yourself with the best practices of bleaching dark hair with developers before. 30vol developer is ideal for lifting 3 levels using permanent hair color depending on the texture and natural depth of the hair.