Anyone who has ever colored their hair has likely heard about toner before. But what is hair toner, exactly? Not to be confused with the stuff you swipe on your face, hair toner is an essential part ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you've spent any amount of time coloring your hair—especially if you've gone blonde—and you've noticed ...

What does hair toner do? “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 ...