Candled yesterday (day 14).
From my 15 bantam silkie eggs two glowed clearly and I took them out (eggtopsy showed one was not fertilized and in the other was a tiny pale embryo, perhaps sadly quitting around day 5). From the 13 developing eggs in the incubator 1 does have a saddle cell.
From my friend's 20 bantam Brahma x Deutsches Buschhuhn-mixes eggs 5 of the rose-brown shelled eggs glowed clearly and I took them out (eggtopsy showed 4 were not fertilized, one did have a tiny grey point, perhaps sadly quitting day 2). Some of the blue and green shelled eggs I could make out (with difficulty) veining but many of them I couldn't make out anything other than normal looking aircells except one green egg even didn't show an aircell, just: darkness. So now I'm sniffing in the incubator every time I refill water and hope to catch possible sulfur smells in time.