Robert has lightened his client's hair. His client says that she feels her hair has brassy, orange tones. Robert decides to use a toner on his clients hair to neutralize the unwanted brassiness. According to the color wheel, what color toner should Robert apply to his client's hair?

Most states require cosmetologists to take a two-part exam to become licensed or certified.  The first part is a written multiple-choice exam covering subjects like skin structure, nail structure, haircutting, facials and sanitation. The second part is a hands-on exam where a cosmetology candidate needs to demonstrate knowledge and skill in like haircutting, color application and manicure.