Ok...made a candler and tried it out. My duck eggs are arriving tomorrow, so I wanted to practice to see if this looks right? I used the lightest tan chicken egg from the Farmer's Market I had, I assume it's unfertilized and has been refrigerated. But is it glowing enough? I could not discern an air sac or yolk, I don't think. Will it be obvious with a lighter colored fertilized egg? Just want to be sure I'm on the right track before I candle the real deal. Thanks!