I have done that with my Blue sumatras, some come out Dark and some will come out light. I generally will breed a splash to that dark of a bird. It works they very well most of them will turn out a nice shade of Blue.
I was going to say buff two. but I would not mix buff with a black. it's not going to turn out the right color. your going to have one half of it buff and the other side black or some other color. I can tell you this much that it is not going to turn out to be a standard color. that is if you...