Wow. Ok, so before y'all have a heart attack over here, I'm going to debunk this video a bit and some of the other comments in here.
1) This is real snow. Even if clouds were seeded, it doesn't make the snow less real. Yes, snow can be impure.
2) When you melt snow with a blowtorch, you are causing sublimation. Look it up. This is 4th grade physical science. This is why the snow in the sink is making water but the snow in her hand isn't.
3) To anyone who is burning anything and touching it to the snow and seeing it turn black, those are particulates from the fuel you are burning.