What is the purpose of using a toner in hair coloring?

The purpose of using a toner in hair coloring is to correct unwanted tones. Toners are specifically designed to adjust the color after the bleaching or coloring process. When hair is lightened, it can often develop unwanted hues, such as brassy or yellow tones. Toners help neutralize these shades by adding a specific pigment that balances the overall color, creating a more desirable and refined finish. The use of a toner is essential for achieving a true and vibrant hair color, especially for those aiming for blondes or pastel shades, where precision in color balance is critical.