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Ding ding! Purple sheen is possible and also remember something about it depending on the type of black background. I cannot remember which one it is but if you are right, then it would be on ER(Birchen) background.
Many solid black chickens actually are Birchen based with extra genes to turn them solid black. (btw, brown red and birchen are the same. Only difference is the former has gold, the latter, silver)
Other than that I can't help much.
Ding ding! Purple sheen is possible and also remember something about it depending on the type of black background. I cannot remember which one it is but if you are right, then it would be on ER(Birchen) background.
Many solid black chickens actually are Birchen based with extra genes to turn them solid black. (btw, brown red and birchen are the same. Only difference is the former has gold, the latter, silver)
Other than that I can't help much.