Wyoming State Board Cosmetology Practice Exam 2025 - Free Cosmetology Exam Questions and Study Guide

The purpose of a toner in hair coloring is to neutralize unwanted undertones. When hair is lightened—whether through bleaching or high-lift color processes—it may exhibit underlying pigments, such as yellows, oranges, or reds. Toners contain different pigments that help to counteract these unwanted hues, allowing the hair colorist to achieve a more desirable and balanced tone.

For example, if the hair has a brassy yellow tone after lightening, a purple toner may be applied as purple is opposite yellow on the color wheel. Therefore, the toner can effectively neutralize the yellow tones, resulting in a cooler, more natural-looking finish. This step is crucial in achieving specific results in hair color and ensuring a polished overall look.

The other options, while pertinent to hair treatment, do not specifically describe the primary role of a toner. Enhancing shine is often achieved through additional products such as serums or glosses, adding color depth usually depends on the initial color application rather than toning, and stripping previous color involves the use of color removers rather than toners.