Keum-boo is about as permanent as any bonding gilding technique. Keum-boo - also know as Geumbu, Kum-Boo, and Kum-bu - is a Korean gilding technique whose etymology literally means 'attached gold'. Thus, the wise amongst you will have realized that the technique essentially involves attaching gold to another metal. The original Korean method utilized this technique with silver, though it is often used with iron, copper, aluminum, gold alloys, white hold, palladium, and platinum nowadays, especially since this technique has migrated away from its Eurasian origins and has since become a staple of western gilding and jewelry in general.