After inspection for proper glaze coverage, pieces are ready for decorating. Decorations are either underglaze, in-glaze, or overglaze. Underglaze decorations are the most common technique and include copperplate printing along with classic treatments such as the traditional blue and white done with cobalt (blue), a metal that can withstand the high temperatures of ghost firing. In-glaze decoration is done on the glaze prior to ghost firing, causing the decoration to sink in as the glaze and the decoration mature at the same time. Overglaze decorations are applied to glazed and fired tableware and include applying a non-glaze substance such as enamel or metals (platinum edges or gold leaf) over the glaze.