Keum-boo


Keum-boo

"Keum-boo" (also "Kum-Boo" or "Kum-bu" - Korean "attached gold") is an ancient Korean gilding technique used to apply thin sheets of gold to silver. 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 gilding - 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. (Dhein, 2004)

Examples of this technique have probably been observed, but not positively identified on pieces from the second half of the first millennium B.C. and from the early first millennium A.D. (Oddy,1981)

This technique is used in many cultures, including Chinese, Japanese and in the West to bond gold to other metals, including iron, copper, aluminum, gold alloys, white gold, palladium and platinum. Foil made from gold alloys can be applied to silver and other metals by first depletion guilding the surface of the foil. (Lewton-Brain, 1987-1993)

References

*Dhein, Christine (2004). " [http://www.lapidaryjournal.com/stepbystep/aug04.cfm Keum-Boo Pillow Pendant] "
*Oddy, Andrew (1981). "Gilding Through the Ages"
*Lewton-Brain, Charles (1987-1993). " [http://www.ganoksin.com/borisat/nenam/keumboo.htm Keum-Boo] "
* [http://www.calacademy.org/research/anthropology/tap/ARCHIVE/1998/1998-11--kumboo.html Korean Kum-Boo Metalwork] , Traditional Arts Program Notes, 1998, Department of Anthropolgy, California Academy of Sciences.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Depletion gilding — is a method for producing a layer of nearly pure gold on an object made of gold alloy by removing the other metals from its surface. It is sometimes referred to as a surface enrichment process.[1] Contents 1 Process 2 Variations 3 …   Wikipedia

  • South Korea at the 1988 Summer Olympics — Infobox Olympics South Korea games=1988 Summer competitors=401 (269 men and 132 women) sports=27 flagbearer=Jo Yong Cheol gold=12 silver=10 bronze=11 total=33 rank=4South Korea was the host nation and competed as Korea at the 1988 Summer Olympics …   Wikipedia

  • Dae Jang Geum — End title of Dae Jang Geum Also known as Jewel in the Palace 대장금 Genre Historical fiction …   Wikipedia

  • List of Korean billionaires and multi-millionaires — This is an incomplete list of Korean billionaires and multi millionaires, and also describes wealth in Korea.IntroductionThere are several published Korean rich lists within Korea including ones issued by the wealth valuation company Equitable,… …   Wikipedia

  • List of Korean family names — This is a list of Korean family names, in Hangul alphabetical order. Note: (S) denotes South Korea. (N) denotes North Korea. The most common Korean surname (particularly in South Korea) is Kim, followed by Lee and Park. Together, these three… …   Wikipedia