[Lucid:]

http://en.wikipedia.org/wiki/Halite
Have teh learnin's! D:<

"Rock salt may also be used to make ice cream. It is not actually used in the ice cream mixture; rather, it is used to melt the ice surrounding the can holding the ice cream. Melting is an endothermic process, so when the ice melts it absorbs heat from its surroundings to store as latent heat, thus cooling the ice bath and quickening the freezing process."

we have tons of boxes of rock salt in my garage because it takes so much of it to make the ice cream. D: it's also yummeh in small quantities.