A toner is a haircolor that is used when hair has been bleached to a yellow or pale yellow shade. It is used to even out the bleaching effects and fine tune the color to a particular shade. They are available in many blonde shades from cool/ash tones to warm golden shades. They are also available in pastels. Toners are mixed with 20 volume peroxide and are usually left on the hair from 10 to 35 minutes until the desired shade is achieved.
Another great way to tone hair at home is using Color by Robert Craig haircolor. This gentle formula is available in 21 shades and a clear and conditions as it colors making it the perfect choice for at home toning.