Porosity is the hair’s ability to absorb liquids and chemicals; how does high porosity affect color processing?

• A. Porosity is the hair’s moisture content; high porosity reduces color deposit
• B. Porosity is the hair’s ability to absorb liquids and chemicals; high porosity absorbs quickly, processes faster, and may require lower lift and more bond protection
• C. Porosity is the hair’s natural curl pattern; high porosity affects curl retention
• D. Porosity is the hair’s resistance to liquids; high porosity slows processing

Answer: (B)

Porosity is the hair's ability to absorb liquids and chemicals. When porosity is high, the cuticle scales are more lifted or open, so color molecules and developers can enter the cortex quickly. This causes processing to happen faster, so you may need a lower lift and more bond protection to prevent over-processing and to maintain integrity. High porosity can also lead to uneven uptake, so you might use bond-building products or a more controlled processing approach to keep results even. The other descriptions don’t match how color processing works—porosity isn’t about moisture content, curl pattern, or resistance to liquids.