The silversmith heats the silver to a point at which the metal is so hot, the impurities surface to the top. The silversmith will then scrape all impurities off of the top. The silversmith will do this over and over again, each time removing more of the metal's impurities. He'll do this to the point that the metal is completely free of impurities and he can see his reflection in the metal.
Purify Me.
