The shrinkage rate of approximately 25% allows for even more detail in final piece. It is the best clay for Silhouette CAMEOª cutting. Last but not least it is the best priced silver clay on the market. You cannot torch fire but if you have a kiln your going to love this clay. About Metal Magic Silver Clay combines microscopic particles of silver with water and a nontoxic organic binder to create a material that can be worked with as easily as modeling clay. Objects can be made with simple tools that are then dried and heated in a small kiln. This drives off the water, burns away the binder and fuses the silver particles into solid metal.