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Since it had already been a couple days since I first candled the eggs, I went ahead and candled them again tonight. This time, I candled them on their side like you recommended. Three of the eggs of both nests were moving and clearly viable, but the other three looked like they had never developed at all. I tossed those eggs and, just to make sure I hadn't killed any chicks, I cracked them and they hadn't developed. Now I have a new question. The three eggs from each nest that were alive looked similar to pictures of eggs that were at 12 days old, not 7 days old like they are now. I did store these eggs for a couple to a few days(depends on the egg) before putting them under the hens. Did the eggs grow some before being put under the hens, despite being stored? Oh, and those "blobs" I was talking about, those were the yolks. I completely forgot the inside of an egg isn't just a clear liquid, there's also a yolk in itThe embryos can be seen moving gently on their own if you hold the egg still (and if they are developing) once you get the right angle.
I would candle again in a few days, if some eggs are developing and others are duds the bad eggs can sometimes explode and contaminate the rest (smell them to see if they are bad), or they may crack and attract ants which is often a disaster.
The air sac is clear, you can tell as the light shines brighter through the sac. The air sac also should be stuck on the wide end of the egg and not moving around. If eggs are shipped, or otherwise roughly treated sometime the air sac detaches and floats around to the top of the egg no matter the position which is not a good thing. See photo below, these eggs look like they are at the 5-7 day mark, the last photo probably further along and the embryos should be seen moving:
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