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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]
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.
Water causes damage and results from natural occurrences, technological hazards, or mechanical failures. Many cases of water damage can be traced to accidents or neglect. "A great many of the materials that museum objects are made of are highly susceptible to contact with water and can be severely damaged by even brief contact, while others may be exposed to water for longer periods without harm.
This can refer to the chemical reactions or corrosion that takes place, the rate of deterioration and decay, and the ultimate preservation of the shipwreck artifacts. When shipwrecks are in freshwater environments, they tend to be in a better state of preservation due to the lack of salinity in the water, and overall, have a lower degree of ...
The $1 silver certificate from the Hawaii overprint series. 1899 United States five-dollar Silver Certificate (Chief Note) depicting Running Antelope of the Húŋkpapȟa. Silver certificates are a type of representative money issued between 1878 and 1964 in the United States as part of its circulation of paper currency. [1]
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To restore the workability, the silversmith would anneal the piece—that is, heat it to a dull red and then quench it in water—to relieve the stresses in the material and return it to a more ductile state. [14] Hammering required more time than all other silver manufacturing processes, and therefore accounted for the majority of labor costs ...
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