Which type of hair product is primarily used to ensure even color results during hair coloring?

Color fillers are specially formulated products used during the hair coloring process to create a more uniform base and ensure even results. They help to add the necessary underlying pigment to the hair, especially when working with highly porous or previously color-treated hair. This is crucial because hair can absorb color differently due to its condition or previous treatments, which can lead to uneven results. By using a color filler, you can effectively neutralize underlying tones and provide a more balanced canvas for the new hair color.

In contrast, moisturizers, conditioners, and shampoos serve different purposes in hair care. Moisturizers tend to hydrate and soften the hair, conditioners primarily help with detangling and improving manageability, and shampoos are used for cleansing the scalp and hair. While these products are important for maintaining overall hair health and appearance, they do not specifically address the need for uniform color application during the coloring process.