Sapphire Blue, Aquamarine and Blue Zircon Hardness: 8.0 Refractive index: 1.728 Specific Gravity: 3.64 Dispersion: …020 Heat Sensitivity: None Hard, durable and great colors.
Metal Clay firing test results;Silver 1200F-1HR-OK, Silver 1475F-1HR-OK, Silver 1650F-2HR OK, Bronze 1525F-2HR-OK, Copper 1778F-30min-OK