A Raku grand piano tray, 9 1/2 inches x 7 1/2 inches. This beautiful tray gets its patina by way of a Raku firing process. The bisqued piece is glazed with special Raku glazes that have copper oxide and silver nitrate in their mix and placed in a Raku kiln and fired to 1950 degrees. It is taken out of the kiln while flaming hot and placed in a container with combustables. The flames lick the glaze causing flashes of color. It is then smothered by covering it up and the reduction process the begins creating other combinations of colors.
Just use soap and water to clean