Dark eggs at candling.

[indigo flats]

OK I am in 9 days on incubation and while candling my eggs they are blue eggs and hard to candle but what I do see is an air sack or bubble and the rest of the egg is as dark as it can be. Can't see anything but dark. When I candle at 6 days I am positive I seen veins. Can some one tell me what is going on here?

 

[dekel18042]

OK I am in 9 days on incubation and while candling my eggs they are blue eggs and hard to candle but what I do see is an air sack or bubble and the rest of the egg is as dark as it can be. Can't see anything but dark. When I candle at 6 days I am positive I seen veins. Can some one tell me what is going on here?

Sounds like they are doing OK. You can mark a line with a #2 pencil and when you candle again, (give the chick time to grow) see where the line is. The air space should be shrinking as the chick grows.

 

[indigo flats]

Humidity is at 43% and temp fluctuates between 99.3 and 99.7. Why in three days does it go from veins to completely dark?