Which type of hair is typically less compatible with alkaline perms?

Fine, fragile hair is typically less compatible with alkaline perms due to its delicate structure. Alkaline perms operate at a higher pH level, which allows for a faster processing time and a more robust curl formation. However, this higher pH can also be damaging to fine, fragile hair, which is already prone to breakage and stress. The strength of the alkaline solution can lead to over-processing, resulting in excessive dryness and damage.

With fine, fragile hair, it is often more beneficial to use an acid-balanced or non-alkaline perm formulation, which is gentler and better suited to maintain the hair's integrity while still achieving some degree of curl or wave. In contrast, other hair types such as thick, coarse hair, color-treated hair, or curly hair might have different levels of resilience and compatibility with alkaline formulations, making them better candidates for traditional alkaline perm treatments.