What should be done if a client has brassy hair after coloring?

When addressing brassy hair after coloring, using a toner is the most effective approach. Toners are specifically designed to adjust and neutralize unwanted tones in the hair, particularly those that result in brassiness, such as yellow or orange hues. By applying a toner, you can achieve a more balanced and polished color, enhancing the overall appearance of the hair.

Clarifying shampoos could strip color and may not effectively neutralize brassiness, as they are primarily used to remove product buildup. A leave-in conditioner, while beneficial for hydration and smoothing, does not have an impact on the color itself. Meanwhile, heat styling tools can inadvertently enhance brassiness by reflecting warmth back into the hair. Therefore, the optimal solution to counteracting unwanted warmth is indeed to utilize a toner.