Art Clay Silver clay is a magical medium consisting of finely ground pure silver mixed with non-toxic binders and water. This off-white, malleable clay can be easily worked into unique and personalised jewellery or ornaments, and once fired, the binders burn away leaving pure, 99.9% silver which can be hallmarked ‘.999’. Art Clay Silver 650 metal clay is a low temperature firing clay. It can be kiln fired at 650˚C for 30 minutes or 780˚C for 5 minutes or it can be fired on a gas hob or with a blow torch (see how from our page in the Resource File). Shrinkage is approx. 8-9%. 10g