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I believe the sheen is genetic and will pass on. Purple sheen cannot be made green no matter what you feed them or how you keep them. I have crossed purple sheen to green and find it often results in both sheens on the bird. I try not to use the purple ones. ("Beetle Green" is desired.) According to Sigrid Van Dort, the presence of Ar+ (Autosomal red) will enhance the green sheen. The purple sheen suggests ar (the absence of Autosomal red). Melanisers are responsible for the green sheen so you might find a BCM cock with a purple sheen gives you more copper on his daughters. Might be worth trying ....
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