I read that the BCMs lay the darkest eggs of all the Marans. I agree with you Azriel that they are darkest when they first start to lay and fade as they get farther away from when they first start. However, after the molt they get dark again (but not as dark as the first time). Mine do a fairly good job of giving me an egg a day. I have cuckoos and they are supposed to be the best layers in the Maran group. Just what I learned when I was picking a Maran breed.