Refraction Index: 1.73-1.76 Hardness: 7.0-7.5 Specific Gravity: 3.65-3.87 Treatment: Synthetic
Metal Clay, safe to fire. Test Results, Silver 1200F-1HR, Silver 1475F-1HR, Bronze 1525F-2HR, Copper 1778F-30min. Safe to use torch and safe to use carbon.