Search results
Results from the WOW.Com Content Network
By contrast, depletion gilding is a subtractive process whereby material is removed to increase the purity of gold that is already present on an object's surface. In depletion gilding, other metals are etched away from the surface of an object composed of a gold alloy by the use of acids or salts, often in combination with heat.
A distinctive depletion gilding technique was developed by the Incas in Pre-Columbian South America. "Overlaying" or folding or hammering on gold foil or gold leaf is mentioned in Homer's Odyssey (Bk vi, 232). [2] Fire-gilding with mercury dates to at least the 4th century BC, and was the most common method until the Early Modern period at least.
Keum-boo (Korean: 금부; also Geumbu, Kum-Boo or Kum-bu—Korean "attached gold") 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 a surface of sterling silver to bring up a thin layer of fine silver.
In depletion gilding, a subtractive process discovered in pre-Columbian Mesoamerica, articles are fabricated by various techniques from an alloy of copper and gold, named tumbaga by the Spaniards. The surface is etched with acids, resulting in a surface of porous gold.
Gold parting is the separating of gold from silver ... The surface was compacted and heavily burnished and indicates early use of depletion gilding.
Ego depletion, idea that self-control or willpower draws upon a limited pool of mental resources that can be used up; Depletion (accounting), an accounting and tax concept used in mining, timber, petroleum, or other similar industries; T-cell depletion, process of T cell removal or reduction
The gold Muisca raft in the Museo del Oro, Bogotá. Metallurgy gradually spread north into Colombia, Panama and Costa Rica, reaching Guatemala and Belize by 800 CE. By c. 100–700 CE, depletion gilding was developed by the Nahuange culture of Colombia to produce ornamental variations such as rose gold. [20]
The depletion of resources has been an issue since the beginning of the 19th century amidst the First Industrial Revolution.The extraction of both renewable and non-renewable resources increased drastically, much further than thought possible pre-industrialization, due to the technological advancements and economic development that lead to an increased demand for natural resources.