For dead give away it is just the way the sac kind of floats up and off to the side like that, not sure why, perhaps it is the sac detaching from the egg in preparation of being absorbed, not really sure.
But it starts looking like it is filling the egg. Whereas the other ones are asborbing as this happens, so you never really see the sacs prominently.
And that film is mostly bacteria and blood. Your cuts were too big. That shell is there for a reason and little slits are best. Same with the film, once you do cut you should be misting with water daily to keep the yolk hydrated. I keep a small bottle of water in the incubator for that purpose.
As soon as you open the eggs you get bacterial growth, and if they sit in the egg for a long time then eventually they are just marinating in a bacterial soup. Sorry for the reference, but that is the best way to describe it.
I say this as a reformed cutter.
Bruce
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