I didn’t really think you could candle the eggs to find a little blood. I thought you had to wait until you actually started to see development of a chick? We had always used the base to a big lava lamp to candle ours. I think I’ve had some with blood before but I didn’t usually eat those because I was a little squeamish but my ex-wife had always told me there was older folks that seemed to think there was a difference. I don’t know though. We always had couple roosters running around to too being assholes so, I guess I just assumed. I think maybe my ex-wife had told me something about roosters having to be involved for there be blood so I’ve never really looked it up on my own.