You are looking at a 10g of Art Clay Silver Slow Tarnish Precious Metal Clay that becomes a 99% high quality silver after firing. Not only that, it tarnishes slower than any silver art clay products and maintains its shine with easy jewelry cleaning.
Most silver products, whether pure or sterling, tarnishes as a result of a chemical reaction between air and metal. Regular Art Clay products would tarnish slower but the ST, the first of its kind, tarnishes even slower.
This finely textured clay fires at one temperature setting of 800 degrees centigrade (1472 degrees fahrenheit) for 30 minutes with 8 - 9% shrinkage.