Which type of porosity may take longer to absorb coloring?

Resistant porosity refers to hair that has a particularly tight cuticle layer, making it less permeable to substances like color. This type of hair structure creates a barrier that inhibits the quick absorption of color products, leading to a longer processing time. When the cuticle is resistant, it can prevent the dye from penetrating easily, which is why more time may be needed for the color to effectively develop and show on the hair.

In contrast, average porosity typically allows for a balanced absorption of color, and high porosity hair, which has gaps and tears in the cuticle, absorbs color quickly. Low porosity hair can often resist moisture and color initially, but typically requires additional processing time, unlike resistant porosity which inherently takes longer due to its structure.