Often used after hair coloring to neutralize unwanted hues, toner works on a variety of hair colors. While this solution often targets brassy tones on lightened locks, it can also create subtle improvements for dark hair, including black and brunette shades. Toner serves as the final, blending touch to a coloring treatment to create your desired shade.
Hair that has been colored for years likely boasts strands in an array of colors. Long-term chemical treatments, such as coloring, can impact the hair's porosity, or its ability to absorb moisture. Frequently colored tresses are often more porous, or absorbent, resulting in a deeply pigmented shade. Toner can even out your hair's porosity, resulting in a more even all-over color. Toner can alter dark hair in a number of other ways as well.
Sun exposure and the use of heat-styling tools can also make your hair more porous, which impacts color absorption. Toner softens varied color absorption in highly porous hair.