A pore’s ability to store liquid is called porosity. Average hair porosity is the benchmark for hair color manufacturers. They craft their hair colors to work best on average porosity hair.
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Hair that is in good condition will exhibit average porosity. Average porosity hair will hold color for the life cycle of a hair color application. This typically lasts 4-6 weeks.
Hair that is lacking in pores will need to be treated with a softener before hair color can be applied. Otherwise the hair will not hold the color.
Hair that has too many pores will easily absorb a hair color but will not retain it. Shortly after the coloring process, the hair will shed the color. To properly color overly porous hair, first treat it with a demi-color or filler.
