Candling eggs

A candler is really just a torch with a sort of rubber ring round it that directs the light into a much more concentrated beam. You can achieve the same effect with a normal torch (as long as it's fairly powerful) and a toilet roll inner or kitchen roll inner. Hold the cardboard tube against the egg and shine the torch in at the top. Do it in a darkened room so you get the full effect. Handle the egg extra carefully and don't joggle it at all.

Candling at 8 days is fine, although you won't see much except a few blood vessels and a bit of a "spot". Dark shelled eggs though (from Welsummer or Marans) are harder to look at. As the embryo develops, more and more of the contents will appear as a darker mass, with the air space at the blunt end more visible. You can candle again at day 14 and hopefully see a lot more. By day 18 or 19 the whole egg will be completely dark with just the air space visible.

I've candelled mine and done lots of research on t'internet and I cant add any more than the above