Powder is one of the key materials used in the kintsugi ceramic technique. This powder is the powdered leaf of metal - gold is most common, though silver, platinum, copper, and brass have all seen their fair share of usage over the years. Of course, powder alone cannot be used to bind various disparate pieces of ceramic together. Indeed, a binding agent is necessary to do so. Glue is often used, though traditionally a lacquer known as urushi would have been used, sourced from tree resin for hundreds of years by craftsmen in Japan.