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I gather lemon blue is a blue gold birchen. A blue to a gold birchen & back to gold birchen would work. You could use a silver birchen if you could be sure the blue carried gold rather than silver. Sometimes blue or black birds are heterozygous ER (birchen or crowwing?)

The offspring from the blue hen could be blue or black at hatch, often with chestnut on the head. As with encorepistol's cochins the buff is likely to show on the head, breast & shouders of the birds as they get older. Unless the black (or blue) parent was heterozygous for birchen (E/ER) they...