A salon stocks 10, 20, 30, and 40 volume hydrogen peroxide developers. A client at natural level 6 wants to go to level 9 in a single-process color. Which developer is typically required?

a.10 volume, because the higher the level the gentler the developer must be

b.30 volume, because 30 volume lifts approximately 3 levels and matches a 3-level lift from 6 to 9, while 40 volume lifts roughly 4 levels and 20 volume lifts roughly 2

c.5 volume, because demi-permanent will fully reach level 9

d.60 volume, which is only sold in California

Explanation

Approximate rules of thumb taught for oxidative color: 10 volume is deposit-only with little to no lift; 20 volume lifts about 1 to 2 levels and is the workhorse for one-process gray coverage; 30 volume lifts about 2 to 3 levels; 40 volume lifts about 3 to 4 levels and is reserved for resistant hair and high-lift series. A 3-level lift from 6 to 9 is matched by 30 volume. Demi-permanent at 5 volume deposits only and will NOT lift to 9 (option C). 60 volume is not sold in California for cosmetic use (option D). Option A reverses the rule. California licensees apply oxidative color under CCR Title 16 §979.4.

Law Reference: CCR Title 16 §979.4

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A salon stocks 10, 20, 30, and 40 volume hydrogen peroxide developers. A client at natural level 6 wants to go to level 9 in a single-process color. Which developer is typically required?

Explanation

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