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Dark bold spots on duck eggs

post #1 of 2
Thread Starter 

I have 12 duck eggs. I have candled and counted 8 with movement. But there are 4 that have these very dark bold spots that have little to no movement. Are these dark spots bad? And what are they? Should I toss these eggs out? Thanks so much. :D

 

post #2 of 2
Thread Starter 

Nobody can tell what these are?

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