Developed by Mitsubishi Corporation in the early 1990’s, PMC is composed of pure silver powder, water and organic binder in a claylike material.   PMC can be moulded like clay with simple tools into original designs.  When dry the metal clay is fired in a kiln.  During the firing process the binder burns away and the silver particles fuse into 99.9% fine silver which can be polished, soldered, enameled and finished like conventional sterling silver.  Sterling silver is 92.5% silver and copper 7.5% alloy.