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  2. Coin cleaning - Wikipedia

    en.wikipedia.org/wiki/Coin_cleaning

    These coins are graded with a description which lowers the coin's value by 90%. [14] [16] Dipping: The coin is dipped into a dilute acid solution that removes the oxidation from the coin along with a small amount of metal. Overdipped coins result in loss of luster which lowers the coin's grade and appeal. [12] [9] Ivory soap and Water

  3. How to Perfectly Clean Copper, According to Experts - AOL

    www.aol.com/perfectly-clean-copper-according...

    Here's how to clean and polish copper the right way to banish that tarnish once and for all.

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

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

    There are several solutions you can use to clean copper for regular maintenance or even badly oxidized copper. “Our favorite thing to use on brass is Bar Keeper’s Friend,” says McAllister ...

  5. How to Clean Copper: 3 Methods That Actually Work - AOL

    www.aol.com/news/clean-copper-3-methods-actually...

    Copper is an excellent conductor of heat, which is why this metal is so prized when it comes to cookware. Plus, its rose-gold hue scores serious points in terms of aesthetic appeal—assuming the ...

  6. Bronze disease - Wikipedia

    en.wikipedia.org/wiki/Bronze_disease

    The green masses on the coin's reverse are a copper carbonate which formed in the region where the bronze disease was most prevalent. It will be physically removed to ensure that the chlorides have also been removed prior to further conservation efforts. The photos were taken some 20 minutes after rinsing and surface drying.

  7. 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 .

  8. Sheldon coin grading scale - Wikipedia

    en.wikipedia.org/wiki/Sheldon_coin_grading_scale

    These coins were dipped into a dilute acid solution too many times which stripped the coin's surface of luster. [36] Cleaning marks MS62 and lower See: Cleaning (coinage) Corrosion spots: MS62 and lower Copper coins can turn green, while silver coins turn black from oxidation. Wear AU58 and lower

  9. Conservation and restoration of silver objects - Wikipedia

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

    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]