I've never incubated eggs before, we put our guinea eggs in the incubator we made last Tuesday. I candled them today and there were probably half that have definitive veins and embryos, the other half I'm not sure about. Two of them maybe had that circle vein indicating they're dead, another few looked darker on half the egg then the other half but also had what looked like embryos in the darkness? When I found the nest it had been warmer out so I'm not sure if the eggs had started incubating already, I doubt it since the hen didn't stay on them overnight. I'm going to check them again,maybe of Friday, or even next tuesday. What should be looking forif the eggs are no good?