We will be setting our first ever batch of eggs this weekend. I've been reading up on candling. I think I've got the basic idea, but wondered how to figure out what's going on with eggs like Marans. Aren't they too dark to be candled? Are there any other ways to determine whether they are developing? Does weight change, etc.? I wouldn't be too worried about it except I have read several places about the dreaded exploding egg in the bator. Also do you experienced hatchers out there check eggs with magnifier to look for little cracks? (All our eggs are being shipped). Would candling reveal small cracks?