Raku Peruvian Ceramic Bead Bracelet with 8mm walnut beads
Raku pottery's interesting rainbow like glaze effects are created through a unique firing process. The piece is sealed in a glaze with high copper content. The pottery is fired like any other ceramic, but is removed while the glaze is still molten hot. The piece is then placed in a bin of combustible materials. These ignite, causing a reaction with the copper, resulting in a colorful luster and irregular surface patterns.