Dark spot

[Maddygator07]

When I candle my eggs they all look the same except two I can’t see into the dark part at all I can’t tell if it’s moving I can only see the bottom which doesn’t tell me if it’s moving or not I’m leaving them in until hatch day I’m just concerned

 

[Yardmom]

Is this because of shell color? Sometimes you can compare the overall appearance. Watch for leaking or bad smells, but leaving them in to see if they hatch should be fine.