Which of the following hair conditions resists color?

Low porosity hair is characterized by a tightly bound cuticle layer that makes it difficult for moisture and color to penetrate the hair shaft. This means that hair with low porosity often resists color because the color molecules struggle to enter the hair. As a result, when applying hair color to low porosity hair, it may require more time or specific techniques to ensure that the color develops properly and achieves the desired results.

In contrast, high porosity hair tends to absorb color more readily due to its raised cuticle layers, allowing for easier penetration of hair dye. Normal and medium porosity hair also have conditions that facilitate color absorption, making them more receptive to hair color products. Hence, low porosity is distinct in its resistance to color, necessitating special considerations in color application and technique.