Just For Men Easy Comb-in Gray Hair Color with Applicator, Dark Brown, A-45 Just twist and comb. Eliminating grays is as easy as combing your hair. With Just For Men easy comb-in color, one tube of our patented no-mix formula meets one specially designed comb applicator. Give it 10 mins to blend away the grays, then wash it out, for a natural, gray-free look. Great for targeting gray areas or covering grays throughout your hair. Lasts up to 8 weeks until grays grow back. Can't decide between two shades? Try the lighter one first. You can always go darker later. Dark Brown Color A-45 Instantly combs away gray. No mix. No mess. No ammonia. No peroxide.