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  2. Coin cleaning - Wikipedia

    en.wikipedia.org/wiki/Coin_cleaning

    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 ...

  3. Conservation and restoration of copper-based objects

    en.wikipedia.org/wiki/Conservation_and...

    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 .

  4. How To Clean Copper For Tarnish-Free Shine - AOL

    www.aol.com/clean-copper-tarnish-free-shine...

    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).

  5. Pickling (metal) - Wikipedia

    en.wikipedia.org/wiki/Pickling_(metal)

    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]

  6. Glossary of numismatics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_numismatics

    A coin issued in the United States worth $0.10 (ten cents). While the term dime is American in origin, Canadians often use the term as well. dipping The chemical cleaning of a coin with a diluted acid. This "cleanliness" is a result of the surface of the coin being dissolved by the acid.

  7. Tarnish - Wikipedia

    en.wikipedia.org/wiki/Tarnish

    Unlike wear patina necessary in applications such as copper roofing, outdoor copper, bronze, and brass statues and fittings, chemical patina is considered a lot more uneven and undesirable. [2] Patina is the name given to tarnish on copper-based metals, while toning is a term for the type of tarnish which forms on coins.