The term crystallization has entered the language of the marble polishing discipline to explain a process used to preserve a shine on marble surfaces. The crystallization, or vitrification process consists of spraying a fluid onto the marble tiles and buffing it in with steel wool under a buffing machine. The metal wool generates warmth by abrasion and the chemical reacts with the marble, creating a brand new compound on the surface of the stone. This process protects the surface of the stone, provides shine and may even harden the stone, extending its life. It is necessary that this restoration process be carried out only by skilled craftsmen who are thoroughly accustomed to it.