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What is 30 vol used for in hair coloring?

  1. Light cleaning

  2. No lift

  3. Additional lift, up to 3 levels

  4. Maximum lift

The correct answer is: Additional lift, up to 3 levels

30 vol, also known as 9% hydrogen peroxide, is used in hair coloring to provide additional lift. This means that it helps lighten the natural color of the hair and allows for a change in hair color. Other options such as light cleaning (A), no lift (B), and maximum lift (D) are incorrect because they do not accurately describe the purpose of 30 vol in hair coloring. Light cleaning (A) likely refers to using a low volume developer for a gentle cleaning process and no lift (B) means that the hair color will not change at all. Maximum lift (D) is a very high volume developer and may cause excessive damage to the hair. 30 vol is the optimal choice for achieving a lift of up to 3 levels without causing excessive damage.