Well, quite; I know sulphur melts, but I’m trying to get my head around how you’d use it to cast a footprint in snow without just melting the snow.
It’s an interesting one! The technique is detailed here:
http://www.courttv.com/onair/shows/forensicfiles/techniques/casting.html
I wonder if in fact the molten sulphur is supercooled, so that it is actually below its freezing point when you make the cast. The snow would then allow solid sulphur to nucleate, freezing it solid instantly on contact. Although since they state that you have to wait 30 minutes for full solidfication I guess not…
I imagine you do destroy the footprint during the process.
Sulfur is an ingredient in some topical acne treatments.
How else would one spell it?