What is the function of a toner in hair coloring?

The function of a toner in hair coloring is primarily to counteract unwanted tones and enhance the overall color result. After hair has been lightened or treated with color, it may take on shades that are not desirable—such as brassy yellows, oranges, or uneven tones. Toners are specifically formulated to neutralize these unwanted hues by introducing complementary colors. For example, violet toners are often used to cancel out yellow, while ash toners can help to diminish orange tones.

Using a toner helps in achieving a more balanced and aesthetically pleasing final color, which is vital for clients seeking specific shades or a natural look. Additionally, toners can enhance the depth and richness of the hair color, giving it a professional finish that is often expected after a coloring service.

Other options suggest functions like lightening hair, sealing the cuticle, or adding moisture, none of which accurately describe the primary purpose of toner in the hair coloring process. Lightening is achieved with bleach or lightening agents, sealing the cuticle refers to lock in moisture and protect hair (often done with conditioners or specific treatments), and adding moisture pertains to hydrating products rather than toners. Hence, the emphasis on toners as tools for color refinement and correction makes