Color Wow Root Cover Up for blond hair and for dark brown hair, $30 each; ulta.com.The Claim: Whether you're looking to mask gray or telltale roots, this convenient kit lets you keep your secret. Ions in the powders help them cling to the surface of your hair for full coverage that lasts until you shampoo. And unlike some matte, one-dimensional touch-up products, the brand's four shades contain multitonal, light-reflecting pigments that produce shiny, natural-looking color.
Expert Opinion: "The powders have a hint of shimmer, which helps keep the tone from looking artificial," says N.Y.C. stylist Matt Fugate, who also gives major props to the "elegant and beautiful" compacts. "To get the most precise application possible, you can tap the smaller end of the enclosed brush directly over roots."
Our Take: A brunet staffer with overgrown highlights uses the honey hue to conceal mousy strands around the hairline. "It takes a few minutes—I have to work with small sections and go over each of them several times to get a dense dose of color. But the finish is totally believable!" Sometimes she switches things up, using the brown powder to darken roots for an ombré effect. "The powders don't smudge and last for about six to eight hours before they slowly start to fade."Read MoreLess