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Yes, there is not as much known about egg color as about some other traits. One of my friends asked me about the idea of losing color by crossing two lines, even if both lines were laying dark. I don't have personal experience with it (yet) but my thinking is that there are so many different genes involved that maybe line A uses ones set of genes to achieve it's color but line B has some different genes for it's color. Then when you cross them a lot of the birds don't get enough of the right genes to make dark eggs. But by breeding them back to the parents the next generation picks up more of the genes and the color starts to come back. Does this make sense?