Milady Cosmetology Practice Exam

What is the primary reducing agent in acid waves, characterized by a low pH?

1. Ammonium Thioglycolate

2. Glyceryl Monothioglycolate

3. Hydrolyzed Wheat Protein

4. Thioester

The correct answer is: Glyceryl Monothioglycolate

The primary reducing agent in acid waves, characterized by a low pH, is glyceryl monothioglycolate. This compound is specifically formulated to work effectively in conditions where acidity is present, allowing for a gentler wave that is less damaging to the hair compared to other types of waves that utilize stronger reducing agents. Glyceryl monothioglycolate has a pH level that is lower than traditional perm solutions, which typically allows for better control and less swelling of the hair structure. This characteristic is crucial as it leads to a more reliable and favorable outcome in perming processes, resulting in softer and more natural-looking waves or curls. While ammonium thioglycolate is another well-known reducing agent, it is associated with alkaline products rather than acid waves. The other options, hydrolyzed wheat protein and thioester, do not serve as primary reducing agents in the context of perming; hydrolyzed wheat protein is primarily used for moisturizing and repairing hair, while thioesters are not fundamentally utilized in traditional wave-setting processes. Thus, the unique properties of glyceryl monothioglycolate make it the correct choice as the primary reducing agent in acid waves.