Question: what is the difference between 10 and 20 volume creme developer?
Answer: The 10 volume developer is a standard oxidizing level for permanent, no-lift hair color. ... It also opens the hair cuticle layer, allowing the color molecules to penetrate and deposit in the cortex. The 20 volume developer opens the hair cuticle but unlike 10 volume, it provides lifting of the hair by one to two levels.