Today, we candled our eggs. If an egg is developing properly, on day seven you may see a clear demarcation of light and dark within the egg. Candling devices of lesser brightness may show the top half of the egg as darker while the bottom half remains clear. A visible network of fine blood vessels reaching toward the air space is a very good sign that everything is going perfectly. If you have a good candling device, you may be able to see the embryo itself. The eye spots will be the darkest and are the easiest part of the embryo to see during candling. We could see an eye spot on egg #4.