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The prevention and removal of surface dirt and corrosion products are the primary concerns of conservator-restorers when dealing with copper or copper-alloy objects. Perseus with the Head of Medusa , bronze, by Benvenuto Cellini, in the Loggia dei Lanzi gallery on the edge of the Piazza della Signoria in Florence; picture taken after the statue ...
The practice of coin cleaning during the modern era dates to at least the mid 1800's in the United States. In 1857, half cents and large cents became popular with collectors after they were discontinued due to the rising costs of copper. [1] During this time cleansers were used on these coins to try and make them appear mint red again. Another ...
Bronze disease is an irreversible and nearly inexorable corrosion process that occurs when chlorides come into contact with bronze or other copper-bearing alloys. [1] It can occur as both a dark green coating, or as a much lighter whitish fuzzy or furry green coating. [1]
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).
Renaissance Wax is also commonly used in the preservation of bronze and copper coins. The wax seals the coins and helps prevent deterioration from moisture and air exposure. It may [citation needed] also help prevent the onset of the chloride-related corrosion commonly called bronze disease, although it won't arrest this once started.
Metals with active corrosion fare better with lower relative humidity: copper or copper alloy objects up to 35% RH and iron objects 12–15% RH. Clean and well organized storage areas are important but materials in the environment are also considered. Wood and wood-based products (particle board, plywood) can off-gas and cause metals to ...
But just as coin collectors did with quarters and dimes after 1964, when the coins went from being 90% silver to a copper-nickel blend, some intrepid entrepreneurs have now started bagging up old ...
Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, and rust or scale from ferrous metals, copper, precious metals and aluminum alloys. [1] A solution called pickle liquor , which usually contains acid , is used to remove the surface impurities.