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No way to tell that I'm aware of other than by breeding. A black cock with no red leakage that is known not to carry chocolate would be the best cross, imo, to determine what you're working with there. A single chocolate looking chick, and she has to be dun. Not a single chocolate chick and she has to be recessive chocolate but you'll know that 100% of her cockerel chicks carry chocolate but none of the pullets will.
Very nice