PSI Cosmetology Practice Exam

Which of the following hair conditions resists color?

1. Low porosity

2. High porosity

3. Medium porosity

4. Normal porosity

The correct answer is: Low porosity

Low porosity hair is characterized by a tightly packed cuticle layer that makes it difficult for moisture and color to penetrate. This resistance to color can be attributed to the smooth surface of the hair cuticle, which repels moisture and chemical treatments effectively. When hair is low porosity, it tends to require more effort to achieve even color application, often requiring added heat or specific products designed to aid in opening the cuticle for better absorption. Medium and normal porosity hair allows for a balanced absorption of color and moisture, while high porosity hair has a more damaged or altered cuticle that readily accepts color but may lose it quickly as well. This distinction highlights why low porosity hair is the primary type that resists color effectively.