Highlights should be applied to unwashed hair because the scalp's natural oils protect it during the highlighting process. Hair washing removes the protective oils from the scalp. Allow for at least 24 hours between the last shampoo and the highlighting procedure.
If a stylist applies three different color shades, it adds dimension for a more natural look. Use a toner on highlights that are brassy or too blond to tone them down. Maintain highlights with a reapplication of color when roots start to show, which typically occurs between four and six weeks. Shampoo every other day to maintain longer-lasting color and shine.