Ultralite Kiln Keum-Boo Covers (2) Red Brass

Ultralite Kiln Keum-Boo Covers (2) Red Brass, 4" in diameter.

Specially designed Brass Covers to be inserted on the Ultra-Lite Kiln for firing Keum-Boo.

Keum-Boo is an ancient Korean gilding technique used to apply thin sheets of gold to silver, to make silver gilt. Traditionally this technique is accomplished by first depleting the surface of sterling silver to bring up a thin layer of fine silver. Then 24 carat gold foil is applied with heat and pressure - mechanical gliding - to produce a permanent diffusion bond.

Pure precious metals such as gold and silver have a very similar atomic structure and therefore have a good potential for bonding. Heating these metals to a temperature between 500-700°F increases the movement of the atoms. When pressure is added, this causes an electron exchange at the surface between the two metals, creating a permanent diffusion bond. This diffusion bond occurs far below the soldering temperature for either metal.