- Precious Metal Clay - The definitive version of pure silver clay! Clay with 90% silver content. The original soft texture of clay makes it easy to sculpt. The firing temperature can be fired in a wide range of 142°F to 1982°F (600°C) to 900°C). Excellent shine and high strength. Shrinkage rate of 10-15% from dry to firing. After firing, it will be 99.9% pure silver. Large size / Made by Mitsubishi material / Enjoy a different shine. Even those who normally use art clay silver will use the same, so please try comparison.