Kerastase Blond Absolu Ultra Violet Anti-Brass Hair Mask

When it comes to colour theory, purple cancels out yellow, which is why products designed to remove brassy tones from blonde hair are often a vibrant violet hue. Take the Blond Absolu Ultra Violet Anti-Brass Hair Mask from Kérastase, for example; its rich colour helps neutralise unwanted yellow undertones while hydrating and restoring your locks.