Precious Metal Clay, PMC, by Mitsubishi Materials Create silver works of art with PMC Precious Metal Clay (PMC) is an amazing product first developed and commercialized by Mitsubishi Materials Corporation (MMC). PMC feels like modeling clay and is simple to work with. With PMC Silver, even beginners can create pure silver works of art. News The collection PMC Decade was issued to commemorate the tenth anniversary of the introduction of PMC to America. * PMC stands for Precious Metal Clay. * PMC and PMC3 are registered trademarks of Mitsubishi Materials Corporation. * More than twenty patents have been granted for the production and use of Precious Metal Clay, including Pure Silver clay in Japan, the United States, Europe, Korea, and Taiwan.