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Precious Metal Clay or PMC was developed in the early 1990s

Metal clay is a clay-like medium used to make jewellery, beads and small sculpture. It consists of very small
particles of metals (such as silver, gold, platinum, or copper) mixed with an organic binder and water. Alloys
such as bronze or steel are also available. Metal clay can be shaped just like any soft clay, by hand or using
moulds. After drying, it can be fired in a variety of ways including in a kiln, with a handheld gas torch, or on a
gas stove. The binder burns away, leaving the pure, sintered  metal. Shrinkage of between 8% and 30%
occurs (depending on the product used), but this is exploited by artisans to produce very fine detail.

Silver metal clay results in objects containing 0.999 pure silver - aka fine silver, which is ideal for enameling.
Although gold metal clay is much more expensive to use, the color and richness is phenomenal. It can be
used to make stunning solid gold objects or used sparingly to make beautiful accents on silver pieces.

Lump metal clay is sold in sealed packets to keep it moist and workable. The silver versions are also
available as a softer paste in a pre-filled syringe which can be used to produce extruded forms, in small jars
of slip and as paper-like sheets, from which most of the moisture has been removed.

There are two popular brands of silver metal clay, Precious Metal Clay (PMC) and Art Clay Silver (ACS).

From Wikipedia, the free encyclopedia
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Precious
Metal Clay