Each color formula is as unique as each client. The products stylists use are unique as well, in a sense that they are always changing to make the coloring process quicker and more efficient. With new color products comes new ways to go about doing old coloring techniques. This BTC member wants to know whether new products allow stylists to make the leap from blonde to brunette by eliminating a step—rinsing out the fillers. “Do you have to wash the filler out before applying the dark color? Or can you apply the color right over the filler?