We have to remember that genetics isn't an exact science, there's still a lot that we don't understand.
That being said, it's possible to have a pairing of really browned out parents and get only bright hatchlings and then another pairing of really browned parents and have only browned out hatchlings. The difference would be that the protein that made the brown in the first set of parents was the effect of a different protein reaction than the browning of the second set of parents, and so the proteins created would interact differently when "added" together, if you will.
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