I've seen it change after being thawed. It comes out as it goes in and after a while turns to what is sold in the stores is all I can say. I save what ever I think atracts other deer (and warn the wife ). Shot a doe once while hunting with a new hunter. As I was dressing it I told the young man to go and keep watch, a buck may come. He did and less than 15 min. later got a shot at a very nice buck. It can work but this deer was on her normal path (natural).