What is the function of a toner in hair coloring?

The function of a toner in hair coloring is primarily to neutralize unwanted tones in the hair. When hair is bleached or lightened, it often reveals undertones that may be undesired, such as brassy yellows or oranges. Toners are formulated with specific color pigments that help to correct these undertones, allowing for a more balanced and aesthetically pleasing hair color.

For example, if someone has lightened their hair and it has developed a yellow hue, a purple toner may be applied, as purple is the complementary color to yellow on the color wheel. This application effectively cancels out the yellow, resulting in a cooler, more desirable shade.

Understanding the role of toner is essential for achieving the desired hair color outcome, making it a crucial step in the coloring process, especially after bleaching.