I mean, if what you're trying to keep from melting has a melting point in the vicinity of umpteen bajillion degrees, anything cooler than that could work to keep it from melting.
It's just bizarre to think of a material that would melt the flesh right off your bones (before melting your bones, too!) as a coolant!
It's just bizarre to think of a material that would melt the flesh right off your bones (before melting your bones, too!) as a coolant!