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PSI COSMETOLOGY PRACTICE EXAM (Questions and Answers, 100% Verified) Updated 2023/2024 When using a chemical relaxer, which of the following must you avoid using? bleaches or high-lift color products All of the following are reasons to perform a strand test EXCEPT to determine the type of shampoo that is best for the hair When using a chemical relaxer, it changes the shape of the hair by breaking down which of the following? disulfide bonds When preparing for a virgin relaxer application, which of the following would be done FIRST? performing test for elasticity and porosity
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