What marquisella said. In fact, a good way of telling if you're "doomed" or not with bad color, crack an egg open, remove the inner membrane, and look at the color of the inside of the shell. If it is at all any sort of green shade, that's a bad sign. If it is a nice blue, that's a good thing. A good blue egg should be the same color inside and out. If your eggs seem too teal or green, check the inside and it may tell you that the eggs might change, or might just stay that way.
In my experience, with BBS Ameraucanas, the color can change in the first 3 days. In W/BW Ameraucanas, it does not.
In my experience, with BBS Ameraucanas, the color can change in the first 3 days. In W/BW Ameraucanas, it does not.