EL-137 Black AdventurineCone 06 oxidation: Black Adventurine is a matte, mottled black and metallic dark copper glaze. Cone 6 oxidation: Color changes to a glossy, metallic black gray that breaks over texture. Enhanced mobility. Surface issues may occur. 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.