Raku Quartz Black Rectangular Tile 37.6 x 14cm: Reviving historic glazing techniques through innovative print technology As the revival of studio pottery continues, Raku celebrates the heritage of traditional glazing techniques. With a range of impressive technical attributes, Raku is designed to withstand the rigours of a back of house hospitality environment.: Raku By Churchill: : Black - Vitrified - 14:cm - 5.5:in - 37.6:cm - 14.75:in - Rectangle - Dishwasher Safe - Microwave Safe - Print is positioned directly under the glaze, creating a protective layer over the decoration.