I'm bummed, even though I've got 24 good eggs with chicks still growing in them (and going into lockdown tomorrow night) but my very darkest BCM eggs were all clear. I candled them again last night and they were bright all the way through...I was so careful to make sure there wasn't anything dark inside that I was missing- so when I took them out to egg-topsy, I was just making a tiny hole at the air sac end and then proceeding from there...they were just warm clear eggs- air sacs looked fine, and inner membrane around the yolk and whites. 2 did have blood rings, so those 2 did start something- but the others didn't even start. They were shipped eggs bought from the BST threads here on BYC, but why did just the darkest ones not grow? All the lighter ones seem fine. So disappointing...well, I'll see what I get from these and have to breed any good specimens back to darker egg shell hatched ones next year I guess...
Lisa