@blackbirds13 odd how they started out so dark, and now one already has a bit if copper on the front neck. Hmmm
Fun watching them grow.
@desertmarcy as to my back-up cockerel....
I had one male blue Marans hatch from shipped eggs.... He is not excellent, but pretty good (in regard to type, leg color, tail, etc. Etc. Etc.) but he has zero copper and came from a much too lightly colored egg.
I have no blue in my Marans, and am drooling at the blue.... But I keep smacking myself on the head, trying to remind myself that breeding him in will probably ruin my lovely egg color that I am so very proud of (and that I need to keep dark to keep customers happy), not to mention that if I am not careful I will have to start marketing my Marans as Black, not Black Copper.
So I do have to get rid of him.... Right? Right? If I kept him I would need to have a totally separate breeding pen/program just for him so that I could use him, produce a few females, and after four years maybe get the egg color back up. Right?
Now that there are real "Blue" Marans, it gets confusing when people say they have Blue Marans---because sometimes people just leave out the copper part, but they really meant to say "Blue Copper Marans". OK, that said, if you want to breed Blue or Blue Copper, you should keep them separate from your pure Black Coppers. The modifiers in the Blues will mess up your pure Black Copper. You can use a pure Black Copper to breed into your Blue, but don't use a Black produced from the Blue to breed back into your Black Coppers. Since you said "but he has zero copper" I assume he is supposed to be Blue Copper? If so, and the egg he came from was really light, I would probably scrap that project for now, concentrate on your Black Coppers, and maybe pick up some Blue Coppers later on from someone who has been developing them well.