How can you make a black rose?
Yeah just cut a living rose off the ground, at the bottom of it's stem and then put the rose in a vase of black food colouring, and leave it until the rose is black :)
Food coloring or spray paint would work. Dip it in some clear lacquer or varnish after it dries and it'll 'live' forever.
Place a white rose in water with some black food colouring