20 Or 30 Developer. 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. Choose a 30 volume developer when you want a developer that is stronger for a lighter and deeper color. Volume 20 is the best for gray hairs because a higher number will lift the color from all the surrounding hairs, exposing and emphasizing the gray instead of covering it. Opt for volume 30 developer to change your color by 3 to 4 shades. Volume 30 contains 9% hydrogen peroxide and is ideal for altering your hair several shades. 30vol developer is ideal for lifting 3 levels using permanent hair color depending on the texture and natural depth of the hair. It can also be used for grey coverage on more resistant hair types. What is the difference between 20 and 30 volume developer?