Colorado Cosmetology Written Practice Exam

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Which of the following pH range is associated with a relaxer containing ammonium thioglycolate?

4.5-7.0
9.0-9.6
9.6-10.0
10.0-12.0

The correct answer is: 4.5-7.0

This range of 4.5-7.0 is associated with an ammonium thioglycolate relaxer because at this pH it is closest to the natural pH of the hair and scalp, which is around 4.5-5.5. Option B, 9.0-9.6, is too acidic and could cause excessive damage to the hair. Option C, 9.6-10.0, is also too acidic and could cause scalp irritation. Option D, 10.0-12.0, is too alkaline and could severely damage the hair. Therefore, option A is the most suitable and safe pH range for a relaxer containing ammonium thioglycolate.