Iowa Cosmetology Practice Exam

Fillers are used in hair coloring to equalize the porosity of the hair, creating a more uniform surface for the color to adhere to. This ensures that the color will appear more consistent and long-lasting. Bleaching the hair (A) would remove pigment from the hair, resulting in a lighter overall shade. Fixing uneven cuts (B) would not have any connection to the purpose of a filler in hair coloring. Removing color (C) is not a purpose of using fillers, as the goal is to deposit a new color onto the hair. Therefore, (D) is the best answer for the purpose of a filler in hair coloring.