do you have a real egg candler or are you using the ol flash light deal. The shells are so thick that you raelly need an egg candler to see into them, at that point they are no different than any other egg.
You might could, just watch the heat off of it.
You can get egg candlers reasonable priced too, I would recommend one if you are going to do much hatching. I think Stomberg hatcery sells them, the base modle shipped (which is the one I use) was only about $19 If I remember corecctly.