WHATS this mark on the Java’s egg

[Fraza]

So the Java’s have been very good parents and incubating the eggs a lot but the Dad was sleeping in bed with society’s at night time anyway I’ll skip to the point she wasn’t sitting on the egg today so I took it out and cancelled it and the red viens have gone from the egg and it’s gone to an orange colour from dark yellow just plain orange

However I noticed this black dot on the egg what is it ?

[cindy]

graying in the shell could mean the embryo died.

[Fraza]

cindy oh no I’m gutted it is few days over due now it has gone orange and a black blob to the right side