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Precious Metal Clay (PMC) PMC was developed in the early 1990s in Japan by metallurgist Masaki Morikawa. Precious Metal Clay consists of microscopic particles of pure silver combined with a water soluble, non-toxic, organic binder. The water and binder burns off during firing and a solid sintered (fused) precious metal silver piece remains. Success was first achieved with gold and later duplicated with silver. The PMC brand is manufactured by Mitsubishi Material Corporation and includes the following metal clay products: PMC+ and PMCflex can be fired at 900 °C for 10 minutes or 800 °C for 30 minutes. Shrinkage is approximately 12 - 15% PMC+ is also available in sheet or paper form. Shapes can be punched out of this pure silver paper and used as embellishments or it can be folded into origami shapes PMC3 can be fired at 600 °C for 45 minutes or 700 °C for 10 minutes. Shrinkage is approximately 10 - 12%. PMC3, PMC+ and PMC Flex can be fired using a butane torch, on a gas stove top or for maximum strength, in a kiln. PMC3 is also available in a paste or slip form and it also comes in a delicate syringe form, PMC Sterling can be fired at 815 °C Shrinkage is approximately 15 –20%. Because of the copper content in this sterling formula, firing is a two-step process which also requires firing in a pan embedded in activated carbon. The new “OneFire Sterling PMC” is a fabulous new metal clay. OneFire Sterling PMC allows for a single step firing but with the added strength of sterling. OneFire Sterling PMC can be open shelf fired like the other brands of PMC Silver Metal Clay. No need for activated carbon in the firing process. Simply add pieces to a cold kiln, ramp at full speed to 871-898ºC and hold for one hour Aura 22K is 22-carat gold paste. Aura 22K can be painted onto the surface of silver PMC pieces to add a beautiful 22K gold accent or embellishment.