by Hilde » 30 Jul 2010, 18:36
Mold will not damage a healthy, developing egg. I've had moldy eggs which hatched. I've also had one egg mold up, go slimy and grow microscopic critters like worms and mites, yet the other egg in the clutch right beside it hatched, safe and sound.
Roy Stockwell posted a picture years ago of a clutch of eggs that most people would have pitched (I believe it was corn snakes). There was fluorescent orange mold and slime on at least one egg, yet it hatched out a perfect snake. I've had a few prize winning moldy eggs, some just slimy, no mold, but I learned long ago that they might still hatch. The shell is a good protector of what's inside.
My routine is to keep them until they are at least 3 or 4 months overdue and one of:
deflated - flat, not just a bit smaller than they were.
cracked - lots of cracks which go all the way through the shell - soft eggs will just crack and stay together, hard shelled eggs break
stink beyond belief - open the incubator or container and I gag
explode - usually reserved for hard shelled eggs - most often explode in your face. It's easier if you wear glasses like I do, at least you can take them off to see your way to the bathroom to wash up.
When I retire, I plan to sleep between naps.