What factor primarily influences the absorption of chemical solutions in porous hair?

The absorption of chemical solutions in porous hair is primarily influenced by the condition of the cuticle. The cuticle is the outermost layer of the hair shaft and consists of overlapping scale-like structures. When hair is porous, it means that the cuticle is compromised, either due to damage, chemical treatments, or environmental factors, leading to gaps or openings that allow for greater absorption of chemical solutions.

Chemical solutions, whether they are dyes, conditioners, or treatments, penetrate more effectively through a porous cuticle because the protections normally provided by intact cuticles are weakened. This increased absorption can lead to more pronounced effects when applying various hair products, whether positive or negative, depending on the nature of the solution used.

While the health of the hair and its length may have some impact on absorption, it is the condition of the cuticle that plays the most significant role in determining how easily a chemical solution can penetrate the hair shaft. The color of the hair may relate to how light or dark it appears but does not directly affect the absorption capacity of chemical solutions.