What is the primary ingredient in a true acid wave?

The primary ingredient in a true acid wave is glyceryl monothioglycolate. This chemical is a reducing agent that is specifically formulated for permanent waving and is characterized by its lower pH, typically ranging from 6.9 to 7.2. This mild acidity allows for a gentler process on the hair, making it suitable for more fragile or processed hair types.

In comparison to other agents, glyceryl monothioglycolate offers more control over the wave pattern and texture, providing a softer and more natural curl. It is important to note that the pH level of the solution plays a significant role in how the hair is processed, contributing to less damage compared to alkaline waves, which use ingredients with a higher pH.

The other options represent different types of chemicals used for various hair treatments. Hydrogen peroxide, for instance, is primarily used as an oxidizing agent in lightening services rather than permanent waving. Ammonium thioglycolate is used in alkaline waves, which are more aggressive than true acid waves and have a higher pH, leading to increased risk of damage. Sodium hydroxide is a relaxer that works by straightening hair rather than creating curls or waves. Each of these formulations