Porous hair absorbs product more rapidly and can release it more quickly – causing color to fade. Healthy hair absorbs the proper amount of product.
Hair becomes porous, dry or brittle because to the loss of natural lipids. Very porous hair, where the cuticle is wide open, is usually damaged from over-processing due to too much bleach, over-coloring, and straighteners or due to the over-use of heat from flat irons or blow dryers.
Overly porous hair tends to be damaged. Having the cuticle wide open is like an escape hatch for hair color. Even the best color line can fade more quickly due to unhealthy hair. Damaged hair looks dull and lifeless, and breaks easily.