Manganese Dioxide Glaze. I added extra powellite by eye epbe 10 to the last bit of glaze and applied a band to the top of a previously glazed vertical tile where an 1 2 g sq in. Below 1080c produces blacks and purples and is refractory.
This was applied to piece 37. Black manganese dioxide is more often used in slips and clay bodies where its coarseness yields spots and splotches. Below 1080c produces blacks and purples and is refractory.
Most common source of manganese in glazes.
Loading produced no crystals. Remember to label containers and number glaze tests. It contains 1 manganese dioxide and 3 4 copper carbonate and was applied to piece 38. Glaze 12 consists of 1 part each of glazes 7 and 4 and 2 parts glaze 2.
