I have a Silver Cuckoo Marans, Black Copper Marans, Splash Marans, and Blue Marans hens. I am only getting a really dark egg from the BCM (I know because I kept an eye on her in the nest box and took the egg out after she left). The SCM was a hatchery bird, so I'm not expecting as dark an egg from her. But I raised the Splash and Blue from eggs, very dark brown eggs. Shouldn't their eggs be really dark brown, too? I'm getting a copper egg or two, but only one really dark egg. Is it only the BCMs that lay the really dark eggs? I just set 7 eggs from the BCM in my Brinsea: Here is a photo of the BCM egg on the right, next to some unknown copper eggs. Maybe the other Marans?