I want to dye my hair black with a burgundy underneath. Help?

dying your hair black and then dying the bottom burgundy again would really damage your hair and the color would not show up. What i suggest you do, is section off what you want to dye black. after, coat your hair that you want to keep burgundy with some conditioner and put it in foil and move it away as much as possible. then let your hair down that you want to dye black and dye it avoiding the foil. (btw the conditioner will help it be resistant to dye) if you are very careful, it should work. when you are going to rinse your hair out just be careful.. maybe bend down and have your hair facing downwards (like your going to wrap it in a towel) as to avoid the foil.. because it will end up with a weird tint to it if some black dye gets into it. then after that just section off the new black hair and use a very strong reddish color (because your hair is pretty dark) and it should have a nice red/purple tint to it (i think that will look good with black!) once again just be careful of the other hair, but it will be easier because your dying the bottom this time. Good luck!