I know it's a gamble. These are cheap eggs and I'm only doing it to a few of them. It's all to see what happens. There are 2 inner membranes. The inner of the 2 is clear while the other is more of a white. I realize it will not be able to "sweat off" as much so that is another reason why I'm letting them sit for a week in a low humidity area to jump start the size of the air sacs. The sarran wrap may work best as far as the egg being about to lose moisture. And I know by doing this there is a much higher probability of bacteria invading, but I know exactly what to watch for. If removed in time, one bad egg won't spoil the rest. It's just for fun, as it would be very cool to be able to watch the embryo form in color without the use of a flashlight in a dark room.I have never heard of someone doing this but from my experience with hatching how would you deal with the membrane drying or not being able to sweet off moisture? The shell is porous so whatever you try to use would need to be porous also. The inside membrane is opaque so I don't think you would really be able to see anything even with figuring out the shell issue. Plus a higher probability of a bad egg contaminating your other eggs if it doesn't work, would stink to lose an incubator full of eggs. I would be awesome to see if you could find a way of doing it though.