Dying a white iced cake black I've had an Xbox cake made for my son, but they made it white and I wanted it black. It can't be remade, because it's too late.

Can I do anything to dye it black?

I was thinking about brushing black food colouring on it but I think it will go grey and ruin the icing.
Yep I agree with Stefan I'd get a can of edible spray paint!! (no affiliation)