Candling Questions please help

[silkiechicken]

air sac doesn't indicate fertility, look for the shadow that is the chick.

 

[Mrs MIA]

https://www.backyardchickens.com/forum/viewtopic.php?id=119420

There are photos there...

For the dark green and very dark brown eggs, I use a 2 million candle-power spotlight on a coffee can with a hole in the other end. With the ones you can't see well into, just leave them until just before you take them out of the turner. You will know when you candle them whether they're clear or not. The airsac does become more pronounced in a developing egg, but that doesn't necessarily mean that if you see an airsac it's fertile. It could just mean that the egg is more than a few days old.

Hope we've helped.