Jeweller art of Keum-boo
Keum-boo is an ancient Korean method of gold plating jewelry with the help of thin sheets of gold and silver. This technology is used in many cultures, including Chinese and Japanese and is applied to metals, including iron, copper, aluminum , alloys of gold , platinum and palladium .
Pure precious metals such as gold and silver, have very similar atomic structure, and therefore, have a good ability of mutual ” bonding ” of surfaces . Upon heating the surface of these metals to a temperature of 500-700 degrees increases amlituda vibrations of the atoms of these substances . Increased pressure causes the electronic exchange between the surfaces of metals . This diffusion occurs at temperatures
much lower temperature soldering .