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Depends on what kind of blue you want to make.......
"Andalusian" blue is the result of a gene noted as Bl.
0 copies of Bl = black
1 copy of Bl = blue
2 copies of Bl = splash
So, if you have a *genetically* black bird (a bird with the gene E) rather than a bird that is hiding some sort of pattern gene under a lot of melanin (pretty common in some breeds), then mating the black bird with a splash bird will give you all blue offspring. But if the bird is actually hiding a pattern under melanin (for example, a heavily melanized black copper Marans crossed with a splash Marans), then you could get a mix of colors in the babies.
Depends on what kind of blue you want to make.......

"Andalusian" blue is the result of a gene noted as Bl.
0 copies of Bl = black
1 copy of Bl = blue
2 copies of Bl = splash
So, if you have a *genetically* black bird (a bird with the gene E) rather than a bird that is hiding some sort of pattern gene under a lot of melanin (pretty common in some breeds), then mating the black bird with a splash bird will give you all blue offspring. But if the bird is actually hiding a pattern under melanin (for example, a heavily melanized black copper Marans crossed with a splash Marans), then you could get a mix of colors in the babies.