What type of wave is processed by the application of an outside heat source?

The type of wave that is processed by the application of an outside heat source is a thermal wave. This type of wave relies on heat to modify the structure of the hair, allowing for texturizing techniques such as curling or straightening. When heat is applied during the chemical texturizing process, it helps to relax the bonds within the hair structure, which facilitates creating long-lasting shapes or styles.

Endothermic waves typically involve the absorption of heat from the environment, but in the context of chemical texturizing, thermal waves are specifically related to the heat applied directly by tools such as curling irons or heat guns. This distinction is crucial as the effectiveness of these treatments often depends on the direct application of heat to initiate the desired change in the hair's physical properties.