What is Art Clay Silver Art Clay Silver is a precious metal clay made in Japan. The process is so simple, it can be molded like a water-based clay. Just after 5 minutes firing, the clay become 99.9% silver. Art Clay Silver is also an ecological product. The manufacturer is Aida Chemical Industries Co.,LTD.; a recycling company, has experience in recycling and refining precious metals since 1963. The silver used for Art Clay is from 100% recycling. Art Clay has some series, silver, gold, copper and bronze. Those are made of pure metal powders mixed with non-toxic binders and water. When kiln, torch or stove top fired, the binders burn away, leaving pure silver (over 99.96%), pure copper (over 99.5%), or gold (22K) or bronze (Copper 90%, Tin 10%).