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Solutions that soften, swell, or expand the cuticle scales usually have a/an:

  1. Neutral pH level

  2. Acidic pH level

  3. Basic pH level

  4. Alkaline pH level

The correct answer is: Alkaline pH level

Solutions that soften, swell, or expand the cuticle scales contain ingredients that raise the pH level of the hair. This allows the solution to penetrate the cuticle and reach the cortex, where the desired changes can occur. Options A, B, and C all refer to different pH levels that do not have the desired effect on the cuticle scales. An acidic pH level would actually have the opposite effect and cause the cuticle to contract and become tighter, making it harder for the solution to enter. A basic or alkaline pH level is needed to open the cuticle and allow the solution to work effectively.