New and improved Art Clay Silver formula encompasses the best of all Art Clay types. It has better workability than 650 formula and longer working times than Original, 650 and Slow Dry formulas. It is easier to carve and file in dry state and is quicker to reconstitute from dry clay. Fire with a torch or by kiln in as little as 5 minutes. Fired pieces can be hallmarked fine silver (.999). Use in place of Original, Slow Dry and Low Fire formulas.