Ok so today I decided to cook some of my cayugas eggs, and I cracked one into the bowl with a Rouen egg and it was black!! Well not quite black but real dark compared to the Rouen egg. I read that they can only be black on the outside. Anyways I went and cracked all the other cayugas eggs and they were all the same! Is there somthing wrong with my ducks? And no they are not old. Thanks!