Kentucky Cosmetology State Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The primary purpose of a hair toner is to neutralize unwanted tones. Toners are typically used after the hair has been lightened or colored, especially in situations where brassiness or yellow/orange undertones are present. They help to adjust the overall color by adding a subtle shade that counteracts the unwanted hues, resulting in a more balanced and desirable hair color.

For instance, if a light blonde has warm, brassy tones after bleaching, a purple toner may be applied because purple is opposite to yellow on the color wheel, effectively neutralizing those warm tones. This enhances the overall tone of the hair, making it appear more natural and polished.

The other choices involve altering the hair's darkness or lightness or improving its strength, which is not the primary function of toners. Lightening hair typically involves bleaching processes, while darkening would involve dyeing with darker colors. Strengthening hair can be achieved through conditioning treatments and not through the use of toners, which focus on tonal adjustments rather than hair health or structure.