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I think I remember that....still a coating, not a shell color. But all my brown eggs are white inside(under the membrane). Olive/green eggs are blue inside. In general, my theory applies.

There are only white and blue shells. Brown eggs have brown coating on white shells. Green eggs have brown coating on blue shells. The brown coating can be very light or very dark, and can vary day to day. Only 2 genes determine shell color, a dozen or more control coating color.