No that is not what is happening. I thought of that and ruled it out as the things that end up happening will be the cauliflower effect, all the sudden the candle will burn to hot things like. The things I have experienced ice crystal don't account for if all the sudden it didn't burn or just burned poorly I would have said moisture in the candle. So I did some experimenting and in all most all the candles I made the ones that got frozen had some kind of effect and didn't burn the same as the ones that where in a controled conditions. The heat will effect it also just not with as dramatic results.