Prometheus® Silver Clay 950 will give you the ability to design stronger and bendable jewels. It does not require activated carbon or multiple-steps firing. Just put your dried pieces into your kiln at room temperature on a kiln shelf and full ramp speed to 800°C/(1470°F) for 1 hour. That's all... You can take out your fired pieces while still hot. The shrinkage of Prometheus® Silver Clay 950 is 15%. You can hallmark your pieces as Sterling.