Which type of porosity may take longer to absorb hair color?

Which type of porosity may take longer to absorb hair color?

• A. Average porosity
• B. Resistant
• C. Extreme porosity
• D. Low porosity

Answer: (B)

Porosity determines how easily hair accepts color. When porosity is resistant, the cuticle scales are tightly closed and the cortex is harder for color to reach. That slows the penetration of pigment, so processing takes longer for color to fully absorb. In practice, you’ll often need a longer processing time, and sometimes a higher-volume developer or gentle heat to help open the cuticle and allow the color to take hold. Extreme porosity may absorb quickly but can be uneven, while average porosity accepts color readily, and low porosity also resists absorption—yet the characteristic that means color uptake is noticeably slower and requires more time is resistant porosity.

Porosity determines how easily hair accepts color. When porosity is resistant, the cuticle scales are tightly closed and the cortex is harder for color to reach. That slows the penetration of pigment, so processing takes longer for color to fully absorb. In practice, you’ll often need a longer processing time, and sometimes a higher-volume developer or gentle heat to help open the cuticle and allow the color to take hold. Extreme porosity may absorb quickly but can be uneven, while average porosity accepts color readily, and low porosity also resists absorption—yet the characteristic that means color uptake is noticeably slower and requires more time is resistant porosity.