Promise. “Hair toner is any semi- or demi-permanent hair color that helps enhance the tone of your hair,” says hairstylist Meri Kate O’Connor, colorist at Cooper West Hollywood. And if that ...

The purple pigment drops can be mixed with any of your favorite hair care products, such as shampoos, conditioners, oils, creams, or stylers, to create a toner. Ess recommends her Signature ...