Shells turning gray?

[my1stchicks]

I have a broody muscovy who's been sitting for around 14 days now, some of the eggs have large spots that are turning gray. They look like if you were to put a greasy bag on paper then take it off that kind of look. Are those ones going bad? I candled but can't really tell if the babies are alive or not, I'm really bad at it. Didn't see any veins. Want to make sure I don't throw them out if ok.
Thanks for any help

 

[Bleenie]

Those usually are rotten eggs. did you try smelling them? I sometimes have to go pick out the gray eggs from the broody nests too.

 

[Boggy Bottom Bantams]

yep rotten, get those out before the burst and ruin the nest, candle to be sure but near 100% possitive they are bad

 

[ChickaChickaBoomBoom]

The one gray one we had was almost double in size to the other eggs. I made the mistake of "cracking" it open after all the others hatched. Trust me, you DO NOT want to repeat my mistake. I can still smell it as if it was yesterday. Actually, it was just last week, but I digress.

-Dave

 

[my1stchicks]

Thanks everyone I took them out!