What is the role of a toner in hair coloring?

The role of a toner in hair coloring is primarily to adjust the tone after the initial dyeing process has been completed. Toners are used to refine or modify the color that has been achieved with the dye, especially in cases where the desired shade isn't fully realized or where unwanted undertones may be present. For example, if someone has dyed their hair blonde but ends up with brassy or yellow tones, a toner can neutralize those shades, resulting in a more balanced and aesthetically pleasing hue.

In hair coloring processes, toners typically contain semi-permanent color agents that can enhance cool tones, such as ash or violet, or warm tones, like gold or copper, to achieve a more desirable overall appearance. This step is crucial in the hair coloring process because it helps ensure that the final color is exactly as intended, creating beautiful and vibrant results.