If there is a sloshy kind of yuck in there, then they are for sure dead.
With mine if I looked and saw nothing poking into the air cell and nothing sloshing, and they were past due, I pipped a hole in the air cell to see if there was movement or any response. If no movement at that time, I would tap the inner membrane gently. If it felt solid the chick was dead.
I've been lucky and had 30-50% of each shipped hatch, so I usually did this after the survivors hatched.
One time I decided to candle them and saw a pip, so I closed the bator and sat on my hands. Somtimes there's a little bitty pip that you can't see through the window.
My kids laugh at me. but I also talk to my eggs when I candle and when I think there should be hatching. Sometimes I hear responses before I even open the bator (and then I don't open it, of course).
With mine if I looked and saw nothing poking into the air cell and nothing sloshing, and they were past due, I pipped a hole in the air cell to see if there was movement or any response. If no movement at that time, I would tap the inner membrane gently. If it felt solid the chick was dead.
I've been lucky and had 30-50% of each shipped hatch, so I usually did this after the survivors hatched.
One time I decided to candle them and saw a pip, so I closed the bator and sat on my hands. Somtimes there's a little bitty pip that you can't see through the window.
My kids laugh at me. but I also talk to my eggs when I candle and when I think there should be hatching. Sometimes I hear responses before I even open the bator (and then I don't open it, of course).