Seabreeze asked (and my appologies if it wasnt 'Sea'): "What do you get when you cross a Black Copper with a White?"
The short and best answer is a genetic alphabetical soup.
The Black Copper has many colors and genes at play and white typically dillutes (blues are blacks dilluted with white). You might think you will see blue or blue copper, but this is only in a handful of chicks out of many hatched. I think you will get many mottled birds, showing some feathers masked and others presenting with color. I believe you will see more pyle, which is red and white, and I heard there was one of these is Newnan. This is because white will mask colors, but red will sometimes bleed through to gold/orange (a dilluted red, right?) -- this is seen on many white sports from Black Copper-- in they end up with yellow/gold hackles, backs and sickles. Red is one of the hardest colors to mask, barred (silver) is one of the easier.
Although the sun may also yellow a white feather bird, this bleeding through of color I speak of, is very uniform, and typically located in the same areas (neck, back, saddle). I understand from Ione M, of the MCCUSA standards, that this bleed through color is not going to be permissible (a DQ) in the standards they are proposing to the APA-- eventhough it is allowed by the MCF.
When crossing varieties the subsequent offspring will not breed true, at least not in the numbers you think you will get. They are hybrids and these recessive genes get suppressed. It would be subsequent matings of the original offspring where oddities will have the potential to present... ie a genetic hybrid of a white and black copper presents as a black copper. This black copper chick grows out and is bred to another black copper (carrying its own set of recessive genes) and the get comes out splashed or blue or pyle-- or that infamous red, white and blue seen advertised by some.
I would ask, why are you thinking of mating a black copper with a white? What is your objective? With this information, I can offer you my opinion to of varieties I would use further you along in your quest.
I had set 2 dozen of myself on a friday and ended up setting 4 dozen of 5 I had saved on Saturday. My hatcher only holds 3 dozen. I had plans to make a new hatcher or add a hatching tray to my bator, haven't gotten either done. I have candled the two dozen and only had 2 duds. So I am thinking of putting some under this hen. I have never done the broody thing, how many can I put under her? Anyone ever put eggs under a hen this close to hatching?
