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While the cleaning process involves desalination in order to remove harmful salts that include chlorides, any potential damage depends on the type of metal the coin was originally minted in. [22] Sea water is very corrosive and destructive to silver or copper coins, their value is determined by their original condition as raised and by the ...
Sealed, or lacquered, copper will present as much shinier than raw, or natural, copper—and it's also much easier to clean (tackle sealed copper with a warm, wet dishcloth and dish soap).
Here's how to clean and polish copper the right way to banish that tarnish once and for all.
The conservation and restoration of copper and copper-alloy objects is the preservation and protection of objects of historical and personal value made from copper or copper alloy. When applied to items of cultural heritage , this activity is generally undertaken by a conservator-restorer .
Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of corrosion. In the case of silver tarnish, the silver combines with sulfur and forms silver sulfide (Ag 2 S), which is black. The original silver surface can be restored if the layer of silver sulfide is removed. [4]
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Derveni krater, bronze, 350 BC, height: 90.5 cm (35 1 ⁄ 2 in.), Inv. B1, Archaeological Museum of Thessaloniki, after cleaning and conservation. Conservation and restoration of metals is the activity devoted to the protection and preservation of historical (religious, artistic, technical and ethnographic) and archaeological objects made partly or entirely of metal.
Glass is made from silica and a variety of other components that gives the glass color. Glass, usually, is also referred to the most stable of archaeological materials, but glass artifacts, and glass from the 17th century can go through complex disintegration. Normally glass consists of 70% to 74% silica, 16% to 22% alkali and 5% to 10% of flux.