Colorado Cosmetology Written Practice Exam

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All of the following are relaxers except:

Lye relaxers
No-base relaxers
No-lye relaxers
Thio relaxers

The correct answer is: No-lye relaxers

Relaxers are chemical substances used to straighten hair. They work by breaking down the chemical bonds in curly hair, making it easier to straighten. Option C states "no-lye relaxers," which implies that it does not contain lye. However, no-lye relaxers do contain a chemical known as guanidine hydroxide, which acts similar to lye in terms of straightening hair. Options A and D are incorrect because both lye and thio are types of chemical relaxers. Option B is incorrect because no-base relaxers still contain chemicals that break down the hair bonds, but they are formulated to be gentler on the scalp than lye relaxers. Therefore, option C is the correct answer as it does not contain any incorrect information.