. . . I may know a bit on regular colors as I had the privilege of experimenting on them, but I'm still trying to figure out dragon mixes as I don't really know what genes affects their physical appearance. And believe me, they work differently to regulars.
Both are dragons, so you should get dragons, maybe not clear clean dragons but dragons just the same. You might get red dragons with lots of irids on fins, rather silver (not clean white) body with red-irid fins, maybe some actual red dragons. Not sure how red affects the black dragon though. You might get black coppers with red fins.
Be sure to make a spawn log so we can all learn from your experience.