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What does volume measure in the context of hair coloring?

  1. Hair thickness

  2. Hair length

  3. Concentration and strength of hydrogen peroxide

  4. Color vibrancy

The correct answer is: Concentration and strength of hydrogen peroxide

Volume in the context of hair coloring refers to the concentration and strength of hydrogen peroxide used in the coloring process. This is important because it determines the amount of lift and deposit achieved in the hair color. Options A and B, hair thickness and length, do not directly relate to volume in hair coloring. Option D, color vibrancy, does not accurately describe what volume measures in hair coloring. Therefore, option C is the best and most relevant answer.