Which product is typically used before a colour service to provide an even base?

Using a filler before a color service is essential for achieving a uniform color application, especially when working with hair that has been previously processed or lightened. Filler products are designed to add back lost pigment in the hair, which can create a more even base for the dye. This is particularly important for hair that is overly porous or has uneven color due to previous treatments. By using a filler, stylists can avoid patchy results and ensure that the new color adheres properly across the entire hair shaft. This process enhances the final result, leaving the hair with a richer and more balanced shade.

Other products like a bond builder are beneficial for strengthening and protecting hair, clarifying shampoo is used to remove product buildup or impurities, and moisturizer is helpful for hydrating the hair but does not specifically prepare the hair for color application in the same effective way that a filler does. Thus, while those products serve important roles in hair care, they do not specifically address the need for an even base prior to coloring.