California Cosmetology Written ExamHaircoloringMedium
A client has overly porous hair from repeated chemical services, with a raised and damaged cuticle layer. How will this porosity most likely affect a permanent color application?
- AThe hair will completely reject the color molecules, resulting in no color change
- BThe hair will resist the color, requiring a higher developer volume to achieve any result
- CPorosity has no measurable effect on how hair absorbs color
- DThe hair will absorb color quickly and may process darker or faster than normal, requiring shorter timing or a lower volume developer
Show answer & explanationAnswer & explanation
Correct answer: D. The hair will absorb color quickly and may process darker or faster than normal, requiring shorter timing or a lower volume developer
Highly porous hair has a raised, open cuticle that allows color to penetrate quickly and deeply, often resulting in faster, darker processing. Colorists typically reduce processing time or select a gentler developer volume to compensate.
Why the other options are wrong
- A. Porous hair readily accepts color; it does not reject it.
- B. This describes resistant, low-porosity hair, not overly porous hair.
- C. Porosity significantly affects absorption rate and color result.
Porosity and Color
The hair's ability to absorb moisture and chemicals, based on cuticle condition; high porosity increases and speeds color absorption.
- High porosity = raised cuticle = fast, deep absorption
- Low porosity = tight cuticle = slow, resistant absorption
- Porosity testing helps adjust timing and formulation
Memory trick: Porous hair is a 'sponge'—soaks up color fast and dark.