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What is the difference between 20 30 and 40 volume creme developer and which is better for dark colors?
Wiki User
∙ 14y ago
the difference is the amount of peroxide. 20 has 6% peroxide, 30 has 9% peroxide and 40 has 12% peroxide.
Wiki User
∙ 14y ago
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What is the difference between 20 and 30 volume creme developer and which is better for dark colors?
The difference between the volumes of developers is that 20 volume gives 2 shades of lift, and 30 gives 3 shades of lift. If you are coloring you your hair darker than your natural hair you want 20 volume and also if your only going up 2 shades of your natural color you would use 20.
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