What type of hair is most resistant to chemical processing?

Coarse hair is the type most resistant to chemical processing due to its thicker diameter and more substantial cuticle layer. The cuticle, which is the outermost layer of the hair, is composed of overlapping scales that provide a barrier. In coarse hair, this layer tends to be denser and more tightly packed, making it less permeable to chemicals. As a result, when applying chemical treatments such as relaxers, dyes, or perms, coarse hair generally requires more time and more potent formulations to achieve the desired result. This characteristic of coarse hair means that it can often endure harsher treatments without damage compared to finer hair types, which are more susceptible to chemical penetration and potential damage.

The other hair types listed have different properties that make them more vulnerable to chemical processing. Fine hair has a smaller diameter and a thinner cuticle, which can lead to faster absorption of chemicals but also increases the risk of damage. Medium hair, while somewhat resilient, still does not match the resistance of coarse hair during chemical treatments. Curly hair may vary in its ability to resist processing based on its coarseness but often also requires special care during chemical services due to its unique structure. Overall, coarse hair stands out as the most resilient option regarding chemical processing