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Hi Marcy!
It is pretty common for some Black Coppers to show very little to no copper in the hackles and happens more often (IMO) with the females vs. the males. This is because the birds are "over melanized" or you may see it referred to as "too dark" and it just means that they have too many melanizers or melanotic in the genetics that cover the copper, but it is still there. In my experience, the males that are "too dark" generally have very dark copper in the hackles, little to no copper in the wing bow and little to no copper in the saddles. The females will look all black, but if a person looks close enough and in the right light you will see some very very dark copper in the hackles that almost looks black, but a slight copper or mahogany color will be there, it just hard to see.
In theory, if these hens are mated to an overly red or more red cock bird the chances of getting better copper in some of the offspring is more, but offspring that are still too dark always (In my experience) happen too. On the other hand, many folks have breed the "too dark" birds and got offspring that are rather nice. Also, males can continue to color up for up to 2 years in my experience, so giving them the time they need to mature fully can be very beneficial. I don't notice the females still changing at that age though...pretty much I notice mine are done changing around 6-7 months of age.
A person can still breed them, but just be prepared that it may take a while and some luck (lots of breeding and culling) to get copper back.
I say test mate your birds and see what becomes of the pairings. If you do not like the results you can always switch up birds and try different parent bird combinations to see what the pairings produce. It's all trial and error really.......... and about 90% chance. Hope this helps.
This is a photo of one of my over melanized hens when she was young, now at 1.5 years she still looks the same. Look very closely at her hackles and I believe you can see some color (not black) there that is very dark.