Hair color, in my opinion, is both an art and a science, something one shouldn’t really mess with at home. (Operative word: mess.) But when I can’t get in to see my professional of choice—Gina Gilbert at the Serge Normant at John Frieda salon—I prettify my part with one of two no-commitment gray-concealing products. Color Wow Root Cover Up (shown, $35, ulta.com) looks like a cake of eye shadow and is just as easy to apply. TouchBack marker ($30, touchbackgray.com) works like a pen and comes in eight shades.