Which of the following is a characteristic of ammonia-free waves?

Ammonia-free waves are designed to offer a gentler alternative to traditional perm solutions that contain ammonia. One of the characteristics of ammonia-free waves is that they cause minimal damage to the hair. This is primarily because ammonia, which can be harsh on hair, is not used in the formulation of these waves. Instead, alternative ingredients are utilized that help in loosening the hair’s disulfide bonds without the aggressive effects associated with ammonia.

This gentler formulation is particularly beneficial for clients with sensitive hair, or those who may have previously experienced damage from ammonia-based treatments. The result is less cuticle swelling, leading to softer curls or waves and improved overall hair health post-treatment.

In contrast, the other options indicate properties that do not align with ammonia-free waves. For instance, they do not require high heat; they typically process at room temperature or lower. Furthermore, they are not exclusively designed for straightening, as they are primarily used to create waves or curls. Finally, while they may process relatively quickly, the emphasis on minimal damage is a standout characteristic that defines their primary benefit in hair treatments.