If your hair is naturally dark and you use a single process permanent color on your hair, it will result in a red/orange shade. But, to go from dark to bright red, it will requiring bleaching. Keep in mind that bleaching is a difficult process and should only be done by a professional. If you can't make it to the salon, ask a friend to help you. You don't need to bleach the rest of your hair, you can just do the roots. Remember that bleaching lightens the hair in stages, once you get to the reddish orange stage, wash it off and apply the desired color.