Nary a single person on god's green earth can accurately describe the sheer nuisance that is maintaining colour-treated hair. Expensive, time-consuming, dependent on which special shampoo you choose afterward — it's no wonder the Living Proof Colour Care Whipped Glaze ($29) has become a must-have for editors in between salon appointments. The formula deposits a cationic temporary dye (there are two shades available, depending on your needs: one light, one dark) to neutralise brassiness and fading. Just don't tell your colourist.