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Good question! I know the sun bleaches hair on animals, like Black Angus cattle out here all have a dark reddish tint to them in the spring, and when I raised Dobes in CA., the reds would turn a couple of shades lighter if left out in the sun. Wonder if that is why my Pip cockerel's hackles are looking so much better and darker now in the winter months? He was put out in the summer and the hackle color was not looking promising at all, now they have a more copper tone to them.