What is the function of a colored filler in hair restoration?

The function of a colored filler in hair restoration is primarily to neutralize unwanted tones during the transition. When hair is lightened, particularly if it has been previously colored or treated, it often reveals underlying tones that may not be desirable, such as brassiness or dullness. A colored filler aids in the process by providing a base color that balances these tones before applying a new color.

Using a filler allows for a more uniform application of color by restoring lost pigments and effectively preparing the hair to achieve the desired hue. This preparation helps ensure that the end result is not only visually appealing but also maintains the integrity of the hair after the coloring process. By counteracting and neutralizing these unwanted underlying tones, the colored filler plays a crucial role in achieving a successful color result.