Arkansas Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The two main types of waves in perming are alkaline and acid waves. Alkaline waves, also known as cold waves, use a chemical reaction involving ammonium thioglycolate, which allows them to penetrate the hair more effectively and create a firmer curl. This type of perming is suitable for resistant hair types and typically results in a more defined curl with less heat application.

Acid waves, on the other hand, utilize a milder chemical solution, typically glyceryl monothioglycolate, which is safer for the hair and produces softer, more natural-looking curls. Acid waves require heat for processing, making them ideal for more delicate or color-treated hair.

Understanding the differences between these two types of waves is crucial for stylists, as it helps them choose the right method based on the hair type and the desired outcome. This knowledge allows for greater flexibility and precision in achieving the client's desired hairstyle while minimizing damage to the hair.