Originally developed in Japan during the 1990s, metal clay is basically a clay-like substance that when fired in a kiln or with a torch becomes dense like metal. Though most people use the fine silver form, metal clay is also available in 22K gold. Some jewelry makers consider this medium as an alternative for those who want to work with metal but not with a torch; others see this as just another resource for making jewelry.
Two companies currently manufacture metal clay, and their products are called Art Clay and PMC. Both brands are metal clay; they are just made by different companies.
Each of these manufactures also carry different types of metal clay, such as lump, syringe, slip, and paper. The firing times differ depending on the formulas of each type of clay. The main difference you’ll find between the various types is the amount of metal mixed with the amount of organic material (which is burned out during the firing process). Developments in the technology have lead to metal clays that are made with very small metal particles, and these result in low temperature clays which can be fired with a hot pot or torch rather than a kiln.
Check the manufacturers' web sites for recommended firing temperatures for each of the clay products. Here are a few resources to consider when shopping for metal clay and related supplies:
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