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Vark (also varak Waraq or warq) is a fine filigree foil sheet of pure metal, typically silver but sometimes gold, [1] used to decorate South Asian sweets and food. The silver and gold are edible, though flavorless. Vark is made by pounding silver into sheets less than one micrometre (μm) thick, typically 0.2–0.8 μm.
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 gilding the surface of the foil (Lewton-Brain, 1987–1993).
Gilding is a decorative technique for applying a very thin coating of gold over solid surfaces such as metal (most common), wood, porcelain, or stone. [1] A gilded object is also described as "gilt". Where metal is gilded, the metal below was traditionally silver in the West, to make silver-gilt (or vermeil) objects, but gilt-bronze is commonly ...
A gold nugget of 5 mm (0.2 in) in diameter (bottom) can be expanded through hammering into a gold foil of about 0.5 m 2 (5.4 sq ft). Toi gold mine museum, Japan.. Gold leaf is gold that has been hammered into thin sheets (usually around 0.1 μm thick [1]) by a process known as goldbeating, [2] for use in gilding.
For the metal foil, they tested a variety of metals, but they favored gold because they could make the foil very thin, as gold is the most malleable metal. [15]: 127 As a source of alpha particles, Rutherford's substance of choice was radium, a substance thousands of times more radioactive than uranium. [16]
Chinese ornamental gold silk is a type of silk fabric which employs gold as ornamentation; Chinese ornamental gold silk originated in China and have a long history in China. [1] Gold and silk were precious goods; the combination of both in textiles created one of the most valuable commodities. Several gold-ornamental techniques can be ...
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