How Much 20 Volume Developer To Mix With Hair Color Ion - 5 Secrets To Mixing Hair Color Confessions Of A Cosmetologistconfessions Of A Cosmetologist - 20 volume developer is used to slightly lighten hair (up to 2 tones) and allow permanent pigments to get inside the hair cuticle.

Sep 28, 2021 · how much 20 volume developer to mix with hair colo…