Alabama Cosmetology Licensing Practice Exam

What ingredient is typically found in depilatory creams?

1. Calcium thioglycolate

2. Acetone

3. Hydrogen peroxide

4. Alcohol

The correct answer is: Calcium thioglycolate

Depilatory creams are formulated specifically to remove unwanted hair and typically contain calcium thioglycolate as one of their primary active ingredients. This compound works by breaking down the protein structure of the hair, specifically keratin, allowing the hair to be easily wiped or washed away from the skin's surface. Calcium thioglycolate is effective in creating a chemical reaction that weakens the hair, making it less resistant to removal. Its use in depilatory creams allows for a painless hair removal solution compared to methods that involve pulling hair out from the root. In contrast, the other ingredients listed do not serve this purpose. Acetone is primarily used as a solvent and in nail polish removers, hydrogen peroxide is often utilized for its bleaching properties, and alcohol is typically included in products for its antiseptic qualities or as a solvent, but none of these ingredients are effective for dissolving hair in the way calcium thioglycolate does. Therefore, the inclusion of calcium thioglycolate makes it the key ingredient in depilatory creams.