Auror:
I have a couple of those mil spec flash lights..candling must be an art I do not have...just to let you know, I have had eggs hatch on Day 24 so don't be too quick to discount an egg....
I was so mad when I got home. .. the flashlight didn't work! Hubby says he'll look at it when he gets home from work *sigh* I was so excited too. I did manage to find enough batteries to get one of the LED ones working though (sort of) and could see veining in several of the eggs though one egg has the air sack on the side of the egg. Still couldn't see well in the darker eggs. Honestly, I don't think I'll be discounting any eggs. I'll probably let them all go the entire time and then discard what doesn't hatch. I don't trust myself enough to make the right call on an egg since this is my first hatch.