What is the purpose of a filler in hair coloring?

A filler plays a crucial role in the hair coloring process, particularly when working with pre-lightened or chemically treated hair. The primary purpose of a filler is to provide a base color for better color absorption. When hair has been lightened or is overly processed, it can become porous and uneven, leading to potential issues with color application. By using a filler, hairstylists can ensure that the underlying color is balanced, allowing for even color distribution and improved adherence of the subsequent color.

Filling the hair helps to restore some of the lost pigment, making it easier for the new color to attach effectively. This method is particularly important when transitioning from a lighter to a darker shade or when trying to achieve a vibrant color result on treated hair. By preparing the hair with a filler, the color applied afterward can be more vibrant and last longer, enhancing the overall coloring outcome.