What type of hair takes color the fastest?

• A. Coarse hair
• B. Thick hair
• C. Medium, non-porous hair
• D. Fine, porous hair

Answer: (D)

Color uptake happens fastest when the hair’s cuticle is open and the cortex is easily accessible. Porous hair has cuticles that are raised or loose, so chemical colors can penetrate quickly. Fine-textured hair processes even faster because it tends to have more surface area relative to its bulk and less resistance to penetration, so dye molecules reach the cortex rapidly. Together, being both fine and porous means color moves into the hair fastest. In contrast, coarse hair usually has a tougher, less permeable cuticle, which slows penetration, so it takes longer to develop. Keep in mind that very fast processing can also mean greater potential for over-processing or uneven results, so timing and formulation should be adjusted accordingly.