What type of product is a toner categorized as?

A toner is categorized as a semi-permanent or demi-permanent haircolor product. This classification is based on its ability to alter the tone of the hair without introducing a long-lasting color change. Toners generally contain low levels of ammonia or can be ammonia-free, allowing them to lightly penetrate the hair cuticle and work by neutralizing unwanted undertones, such as brassiness in blonde or gray hair.

The semi-permanent or demi-permanent nature of toners indicates that they do not have the intensity or longevity of permanent haircolor but do provide a reflective or subtle pigment that can last for several weeks. This makes toners an excellent choice for adjusting the shade of already colored or lightened hair. They are ideally used in post-lightening services to achieve a desired hue without significantly altering the hair's structure or base color, allowing for natural-looking results.