What is the main purpose of applying hair toner?

The main purpose of applying hair toner is to adjust the tone of color-treated hair. After hair is colored, especially if it’s lightened, it can sometimes develop unwanted undertones, such as brassiness. Toners help to neutralize these undesirable shades by adding subtle hues that enhance the overall color. For instance, a toner can add a cooler, ashier finish to blonde hair or enhance the richness of brunette shades. This process allows for better control over the final appearance of the hair color, ensuring it is vibrant and pleasing to the eye. Toners are typically semi-permanent and can help maintain the desired color between salon visits.

Bleaching the hair is an entirely different process focused on removing color rather than refining it. Adding volume and protecting hair from heat damage involve separate products and methods that do not align with the primary function of a toner.