Science

Why does my hair color fade?

Why does my hair color fade?

Colour-treated hair undergoes the chemistry of an oxidative hair colouring process which changes its structure. Hair becomes more porous and sponge-like, capable of absorbing water more quickly. So as water enters and exits the hair fiber, it can take with it the hair colour dye molecules that give hair its colour, leading to fading hair colour. Red hair colour tends to be the fastest fading hair colour, as the intense red dyes are smallest and “escape” easily from a porous hair structure

Colour-treating hair can also roughen its surface, which effects how hair interacts with light. Its naturally light-reflective surface becomes uneven [From Color Starting Point POC]. Imagine one vibrant shade of paint—then imagine it in a semi-gloss finish and matte finish. The uneven surface of colour-treated hair can make even a vibrant shade look more like the matte eggshell finish than the semi-gloss finish, and can sometimes be the culprit of the appearance of fading hair colour.