Single process color is just what you’d imagine—a hair coloring process that can be achieved in a single step. This can be anything from an all-over permanent hair color, to highlights that don’t require toning, to a hair gloss.
Single process color is just what you’d imagine—a hair coloring process that can be achieved in a single step. This can be anything from an all-over permanent hair color, to highlights that don’t require toning, to a hair gloss.
