I set some shipped eggs this past saturday and didn't get a chance to candle before putting them in the bator (where the heck is a flashlight when you need it??) I finally got a new light today, and pulled them all out to candle. The blue eggs were obviously scrambled, but I really couldn't see a dern thing in the dark brown ones (welsummer eggs). I took the blue ones out and opened them before tossing, don't need exploding eggs in the garbage! I figured if those were scrambled, then the rest certainly were too, so I opened one welsummer egg. Oops. Perfectly healthy chick. I left the rest of the brown ones alone.