I'm on day 6 (5 with my late egg), and I've just candles (for the first time ever .. *so* exciting!)
The first egg had definite veins running through it - *gasps with amazement*.
The second egg is bigger, the shell seemed too thick to see through.
The third egg, the 5th day egg, seemed empty.
I used a proper Candler and a dark room.
I shall try thro last egg again tomorrow.
Opinions please...