Which statement correctly describes porosity and its effect on perm solution absorption?

• A. More Porous Hair Is Less Resistant To Absorbing Perm Solution
• B. More Porous Hair Is More Resistant To Absorbing Perm Solution
• C. Porosity Does Not Affect Absorption
• D. Porosity Only Affects Color

Answer: (A)

Porosity is about how easily hair accepts liquids. When hair is highly porous, the cuticle scales are more open or damaged, creating larger gaps for a solution to flow into the cortex. That means perm solution can penetrate more readily, so the hair is less resistant to absorption. In lower porosity hair, the cuticle is tighter, making penetration harder and absorption more resistant, which can affect processing time and results. So the best statement is that more porous hair absorbs perm solution more readily, i.e., is less resistant to absorption. Porosity does affect absorption and is not limited to color changes; it influences how chemical treatments penetrate the hair, among other effects.