I've noticed that, at least where I hunt, there doesn't seem to be very much actual black in the woods. There's a lot of dark gray but anything that is actually black seems to jump out at me. I think a lighter color would blend in better. Brown or even green or red, since deer are color blind, would appear as some shade of gray just like everything else to their eyes. My opinion is that the absolute best camo for a bow is snake skin. Never had one with skins myself but have been around quite a few and they really blend in.
Matt