What's the purpose of using a toner after a hair color treatment?

Using a toner after a hair color treatment serves the significant purpose of adjusting the final hair color and neutralizing any unwanted tones that may arise from the coloring process. When hair is dyed, especially when lightening is involved, it can sometimes produce brassy, yellow, or orange undertones that are not desirable. A toner works by depositing a subtle shade over the hair, which can help to correct these undertones and achieve a more balanced and aesthetically pleasing color.

For example, if the hair appears too warm or brassy, a purple toner can counteract those yellow tones, leading to a cooler, ashier finish. This is particularly important for individuals seeking a specific hair color that requires precision and tonal balance. The use of toner is a common practice in professional salons to ensure that the client leaves with the desired shade and overall look.

While the other options touch upon aspects of hair treatment, they do not specifically focus on the role of a toner in color correction, which uniquely positions it as a crucial step following a coloring process.