Single-process color completely changes your hair color and is great for a dramatic change or covering grays. Double-process color involves bleaching the hair before adding a new color, offering ...

- Multi-dimensional color techniques create the illusion of volume and depth by using multiple shades instead of single-process color. - Root shadowing and baby lights can transform sparse areas by ...

Because you don’t need to sacrifice salon-quality results when changing up your hair color.

A breakdown of the real differences, and which one's best for you. Reviewed by Jeremy Tardo Fact checked by Lisa Sullivan Single-process color completely changes your hair color and is great for a ...