Colorado Cosmetology Written Practice Exam

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What is the pH range of a cold wave?

3.0-4.5
5.5-6.5
7.0-8.0
9.0-9.6

The correct answer is: 3.0-4.5

The pH range of a cold wave is typically between 3.0-4.5. This is because cold waves contain strong alkaline ingredients like ammonium thioglycolate that break down the hair's natural structure. Higher pH levels would result in harsher chemical processing and potential damage to the hair. Options B, C, and D all have higher pH levels, which would not be suitable for a cold wave treatment.