So I’ve just candled 10 chicken eggs today at day 7. Air sacs look good and I can see vessels in all of them and obvious embryos in 3. In the others I can see vessels and there is a line in the middle of the egg where one side is dark and the other is clear/light. It doesn’t look like a blood ring from other pictures I’ve seen but more one half is dark and one half is light. My question is can you have obvious blood vessels if you have a blood ring?