So, my beautiful Silkie rooster died a week and a half ago. So I collected all the eggs in the coop to incubate, for the chance I'd get another roo. (My first and only hatching last spring produced all pullets.) Well... for a month before that, I hadn't collected eggs; we've had an ongoing family emergency and I've been so busy... and my hens had been laying on and off anyway, so it wasn't as many eggs as you might think. But there was still a good sized pileup of eggs between five adult hens. I tossed the ones that looked or felt... maybe not so good, but gently washed and put the rest (30 or so) in the incubator a few days ago. I'm crossing my fingers that *some* of them will be recent and viable! So now I'm wondering - how do I weed out the dead ones as time goes on, and keep the good ones? I am absolutely terrible at candling; I tried last time I incubated chicks using a little LED and darkness and I either couldn't see through the thick shells or I'd see nothing, just an even glow. This was during the first week so maybe there was just nothing for me to see? It is 2 days into incubation now, and I can tell that at least one egg is dead (probably a lot more), because there's a puff of slightly-off air when I open the incubator to turn the eggs. I'm worried that dead eggs will effect the live ones (bacteria? releasing something?), and I don't want it to smell weird, too! So aside from candeling, is there a good way to tell a rotten egg from a live one?