Similarly to the tea dye, coffee is for those of us with dark hair. Black tea just isn’t going to cut it for me, I need to pull out the big guns. To cover up your gray hairs naturally, brew a strong pot of coffee. Mix one part coffee to two parts conditioner, and add some of the wet coffee grounds to make sure the color is nice and dark. Massage the coffee/conditioner mix into your scalp, and leave in for at least an hour. Again, the longer you leave it in, the more intense the color will be. Repeat several more times for a darker color.