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On the blue X Black cross; isn't this what the OP was saying; that they were going to breed their blue and Black birds and they expected blue chicks because the Black bird carried the blue gene. Since blue is a dilute Black, I'm not following how blue is supposed to be dominant, but it doesn't matter; one is, one isn't. Maybe the OP has a black bird that they know is from a blue/black cross. If it's heterozygous for Black, that is, a Black bird carrying a blue gene, and there will be blue chicks in the first generation when it's bred to a blue bird. If it is homozygous for Black, there will only be Black chicks, no matter what color it is bred to. But, breeding *those* chicks together or back crossing to the blue parent would produce blue. Does that make sense?
Yes, that is what the OP was saying, I was just clarifying that a black bird cannot possibly carry the blue gene. A very dark blue one can though.
But again, you can't have a heterozygous bird that is BLACK, it has to be blue. Blue is heterozygous, splash (as a pattern) is homozygous. Black is just simply having absolutely no blue genes.
As for your last bit, no. If you get a black bird or two from a blue x black breeding and breed them together, all you get is black.
Bl/bl x bl/bl -- 25% bl/bl ---- bl/bl x bl/bl = 100% Bl
bl = Black
Bl/bl = Blue