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The main difference between Korean bronzeware or bangjja from other bronzeware is the alloy ratio between copper and tin. The bangjja contains much more tin than other bronzewares (Cu:Sn = 78:22 as volume) while the normal ratio of tin to copper is 1/9.
Copper working has been done in central Mexico since the pre Hispanic period. [1] However, it is not the first area in the Americas to begin working with the metal. The first evidence of copper work is in what is now the Midwest of the United States as the metal was found here fairly easily on the surface without mining. [2]
Unworked copper nugget. The native copper, as well as the technique of cold working it, is believed to have come from the Great Lakes area, hundreds of miles to the north of the Cahokia polity and most other Mississippian culture sites, although the copper workshops discovered near Mound 34 at Cahokia are so far the only copper workshops found at a Mississippian culture archaeological site. [5]
Silver is also applied to copper by means of electroplating, and provides an interior finish that is at once smooth, more durable than either tin or nickel, relatively non-stick and extremely thermally efficient. Copper and silver bond extremely well owing to their shared high electro-conductivity. Lining thickness varies widely by maker, but ...
A laundry copper. A wash copper, copper boiler or simply copper is a wash house boiler, generally made of galvanised iron, though the best sorts are made of copper. In the inter-war years they came in two types. The first is built into a brickwork furnace and was found in older houses.
The mining water contains copper salts in the form of copper sulfate CuSO 4. The iron then reacts with the copper, displacing it from the sulfate ions, causing the copper to precipitate onto the iron sheets, forming a "wet" powder. Finally, the precipitated copper is collected and refined further through the traditional smelting process.
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