Author Archives: cs_admin

10 vs. 20 vs. 40 Volume Developer: What’s the Difference and Which Do You Need?

What does developer do to hair? hair dye and supplies on white surface

Quick answer: Developer is the hydrogen peroxide that activates hair color or lightener. The volume number tells you its strength: 10 volume deposits color with almost no lift, 20 volume lifts about 1 to 2 levels, and 40 volume lifts 3 to 4 levels. Higher volume doesn’t automatically mean more blonde, and picking the wrong […]