What is the primary difference between volatile and non-volatile hair colors?

The primary difference lies in the permanence of the hair colors. Volatile colors are indeed temporary, meaning they do not penetrate the hair shaft and can typically be washed out with a few shampoos. They are often used for more transient color effects or for those who like to change their hair color frequently without committing to a long-lasting change. In contrast, non-volatile colors are permanent. They penetrate the hair shaft and are designed to provide a longer-lasting color result that withstands multiple washes, requiring a developer to activate the color and open the hair cuticle for better adhesion.

This understanding distinguishes how hair colors are classified and used in practice. The permanence of non-volatile colors makes them suitable for clients seeking dramatic and lasting changes in their hair color, while the temporary nature of volatile colors appeals to those looking for flexibility and experiments with different shades without a long-term commitment.