good luck with this. I think I tossed viable chicks earlier this year when I thought they quit just before hatch. Further research shows they could have gone to day 25 or longer.![]()
Welcome to the club...

I dare say there are very few long time poultry keepers that haven't done this.
Especially when you're going by the book, and the book (whichever book, really, most of them are alike) is full of over-generalized 'rules'. Of course you threw the eggs, they're not viable beyond a certain date, or so the book said...
Little chick is still alive, I managed to find its beak and peel the membrane away from there so that it can breathe. My plan is to now leave it for 12 hours (it's 8pm here) and see how it's looking in the morning. I know it needs to absorb the yolk, there is blood in the membranes too. I've taken a picture, it's not easy to make out but the chicks beak is there, there wasn't any blood from the membranes there around its face but further down there have been some spots.
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I hesitate to ask you to do something you may not be ready for, but if that chick doesn't hatch in the next few hours I'd help it if I were you.
The membrane is white and dry, that's ready. It looks like it's partially shrink wrapped in a few spots. If it's translucent, it's not ready, but it's already white and papery.
This chick may be late due to a defect of some kind, visible externally or otherwise, so generally worth noting it for future reference. I found chicks that needed assistance hatching should generally not be bred almost as a rule, malpositionings and other causes of failure to hatch unassisted are quite often very hereditary.
Best wishes.