PSI Cosmetology Practice Exam

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Study for the PSI Cosmetology Exam. Utilize flashcards and multiple choice questions, with each question featuring hints and explanations. Prepare effectively for your exam!

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What is the pH range of a cold wave permanent wave?

7.0-8.0
8.5-9.0
9.0-9.6
10.0-11.0

The correct answer is: 9.0-9.6

The pH range of a cold wave permanent wave typically falls between 9.0 and 9.6. This higher pH level is significant because it indicates a more alkaline solution, which is essential for breaking down the disulfide bonds in the hair structure during the perming process. The alkaline nature of the solution helps to swell the hair and allows the chemical agents to penetrate more effectively, facilitating the permanent wave formation. In this context, the disulfide bonds are crucial because they determine the structure and shape of the hair. By modifying the pH level to be on the alkaline side, the cold wave process ensures that the hair can be transformed into curls or waves that will last. Lower pH values, such as those in the ranges mentioned in the other options, would be too gentle for effective lifting and reshaping of the hair's protein structure. A pH lower than 9.0 would not effectively break the disulfide bonds needed for the lasting effects of a perm, emphasizing why the range of 9.0 to 9.6 is critical for achieving the desired results in cold wave treatments.