A 30 volume developer will lighten your hair up to 3 shades, and you use it in dark hair to get to a light color. You’ll apply the mix to your hair and leave it in for up to 20 minutes. Slices of... 4RB + 10 Volume Developer 5C + 9 Volume This runs the risk of inactive color and irritating scalp. 30 volume developer on dark hair how long to leave . If you are going from dark hair and looking to lift several levels of color away, 30 may be the right developer strength for you. Note that 40 volume is too strong for general bleaching as it could burn the scalp. Most haircolor formulas today work with a 10, 20, or 30 volume developer. The place of this volume developer is also crucial. 40 volume developer could lighten the hair of the snow queen, but it’s very rough on your hair. Never go beyond 40 volume—it will burn your scalp and destroy your hair. Volume 30 contains 9% hydrogen peroxide and is ideal for altering your hair several shades. 30 volume developer can be...