Yes, I did peel the membrane off the inside on the left side of the photo (to reveal the olive color).
You have a good memory Ron. I checked and it was three years ago that I posted this! Back then you suggested it could be a thin-shelled egg (as in, the inner blue she'll never formed). It didn't feel thin-shelled though, so I like the porous explanation better. Normally, I would not have noticed the color under the membrane, but at the time, I was peeling the membranes off all my used eggs and saving the shells for an egg-shell mosaic.
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Very nice art project! Love it! It's so cool that you used the natural egg colors. I recently did an egg shell mosaic on a gourd and am in the process of one with a rooster and hen. However, my mosaic is just the accent though.