I just had a set of duds, didn't candle before now. So, to save me some grief, I decided to candle the 5 that I have under my other hen. I did not candle them before - I'm still learning. Anyway, I'm on day 19, and I will do my best to describe my egg appearance. FYI, they ALL looked the same. They are brown eggs. I candled from the fat end, and could see the air space about 1/4" - 1/2" from the end, and then a clearly demarcated line where it then turned dark. The line was at a slight angle from the fat end. I saw nothing else. Does this mean there is a chick in there, or that this is a rotten egg?