Cone 06 oxidation: Malachite is a mottled dark green and metallic black glaze with a matte finish. Not dinnerware safe. Cone 6 oxidation: Color changes to a glossy green that breaks over texture and pools a metallic gray; green/gray crystallization can occur. Enhanced mobility. Surface issues may occur. Not dinnerware safe. TIP: This glaze WILL move. Take care when using on vertical pieces reduce glaze thickness towards the bottom third to minimize run-off. Not overglaze compatible.