Maddison
Songster
from what you've described from candling its normal for eggs to be completely dark during the last days in my experience. also, I've noticed when hatching under a hen the eggs will have a certain stronge stuck smell under the hen and on the eggs, I believe this is natural as its a result of a hens form of humidity for her eggs, only stinkier... so its either that or the eggs are bad. the most I'd leave eggs incubating for is 25 days, beyond that and they are bad. is she consistently on and off throughout this whole broody period, or was she staying on the nest up until now?