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when an egg is dead. . . . . .

They can, yes.

I've had some eggs fertile when laid, show a network of veins for a while, then just stop developing. After that, they gradually go mouldy and collapse. From what I've seen, this can happen at any stage of incubation.

I've had it happen to odd eggs in the middle of otherwise successful clutches, so I don't think it's a problem with the incubation method.

I guess it just happens when something is badly wrong with the embryo. Nature slams the brakes on the process.
 
Each one seems to be different.

Some can stay in a part-developed limbo before they start going bad.

Last year I had a clutch with really bad shells, that you could see through very easily. I lost at least four of the eggs at different stages of development. A couple developed a network of veins in the first 2 weeks of weeks, then stayed like that while other eggs carried on to develop embryos. The part-developed egg stayed like that, with no further development, for a few more weeks before finally going mouldy and collapsing. Think one was as late as 6 weeks into incubation before it finally died.
 
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