It takes a thousand BTUs to melt create steam from water. Even more from snow...
Whereas a butane flame (yellow) contains a lot of carbon. and will turn to a black residue black when directed at something cold.
Put some distilled water in your freezer and freeze it, and the same thing will happen with a butane flame...
OK that sounds very right science wise. Does this cover the burnt plastic smell as well? I've used both a lighter and a match. and I get the same smell when it melts. and it is rank!
Somebody did burn an icecube and it melted.