Black birds hatching out of a blue copper mating are NOT black copper Marans. They are blue-bred blacks and are not for a BCM breeding program, but fine to use in a blue copper pen. What color birds what your blue copper mated to?
A blue copper hen and you can't get black coppers? I guess someone lied to me.
Ihilani Coffee is not saying you wont get blacks, you will. But, if you are breeding Black you do not want to use blacks bred from blues. You can use those in a true BBS program. Breeding black should be done only using blacks bred from blacks. Most people who are looking to breed Black Coppers exclusivley will want blacks bred from only blacks. Someone with more knowledge can expand on this point.