CG, could you take a dark blanket and show the darker eggs to a few students at a time? I bet you are all getting excited! Less than 10 days to for your eggs!
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A pic would be helpful, but I think I know what you mean. Could it be the yolk? I've had some that had the dark spot and then the rest of the egg is lighter, but not as light as the air sac.I cancelled my eggs ( it's about day 11) and some are dark but one side of the egg is light, like it's part of the air sack, I've cancelled and hatched eggs before but I can't remember this ever happening. Is this normal??