After candling many, many eggs over the past couple of months I have discovered that some eggs that appear to have blood rings...that is...a red ring that goes all the way around the egg...end up developing chicks that hatch. I think what they really are is the bottom portion of the veining "web". I even had a couple that I couldn't really see the typical spider looking veins...just the red ring...and I didn't throw them out. At day 14 they both had chicks with veins and they hatched on day 22. Miss Prissy...you are soooo right. Don't throw anything out...even a "blood ring" until day 14!!