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I'm sure someone has, it would work the same. If an egg is blue, olive, or any shade of green the hen that laid them carries the blue gene. The blue gene I've seen in my experience is very dominate. I had an ole Easter Egger hen when I was five years old that laid a greenish shade of egg and she was the mother to many mixed breeds offspring, the green eggs continued to pop up for several generations even twelve years later even though she was bred to other breeds that did not carry the blue gene. I eventually had chickens that looked just like jungle fowl or some game birds that half the hens would lay greenish eggs and half would lay light tan. But what's cool about this project is breeding something carrying the blue gene crossed with a heavy brown gene like in marans.