What color are the shells? Darker shells are harder to see into and there may be veining but you won't see it unless you have a strong flashlight or candler.Noob question here: I have 11 eggs incubating. They are at day ten. I candled them yesterday and about half of them had vein formation. The others had a dark half like there was something going on, and one was almost completely dark except for the air cell, which was still pretty small. What does this mean? If I can't see veins by day 10 does that mean the egg is not developing and won't hatch?