Kansas Barber Practice Exam

Question: 1 / 400

What chemical is commonly used in permanent waving solutions?

Glycolic acid

Thioglycolic acid

Thioglycolic acid is the chemical commonly used in permanent waving solutions. This compound is effective because it breaks the disulfide bonds in the hair's protein structure, allowing the hair to be reshaped. When applied in combination with heat and time, thioglycolic acid can create long-lasting curls or waves by creating new disulfide bonds in the desired shape.

The other options do not serve this purpose. Glycolic acid is primarily used in skin care products, acetic acid is often associated with vinegar and used for its preservative properties, and theophylline is a drug typically used in treating respiratory diseases. Therefore, thioglycolic acid’s role in altering the structural bonds in hair makes it essential for creating permanent waves effectively.

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Acetic acid

Theophylline

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