Hardness: 9 Refractive index: 1.76 Specific Gravity: 4.0 Dispersion: .018 medium Heat Sensitivity: None
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.