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Coins with untouched original surfaces are generally more desirable than those that have been cleaned, although lightly cleaned coins with no damage done may still receive a normal coin grade. Improper cleaning can result in a coin's surface being damaged beyond repair, which is why expert attention is needed for potentially valuable coins.
The Statue of Liberty, showing advanced patination; verdigris is responsible for the statue's iconic green colour.. Verdigris (/ ˈ v ɜːr d ɪ ɡ r iː (s)/) [1] is a common name for any of a variety of somewhat toxic [2] [3] [4] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.
Dark tarnish spots are sometimes located on the surface and may need to be polished more than once to remove. Over polishing is an issue with silver and can cause harm to the surface of the metal. After polishing, the silver object is rinsed in deionized water and dried with a cotton cloth.
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The patches of bronze disease can be scraped off the surface using a fingernail or a wooden pick. These properties are all in comparison with verdigris, which is normally a duller shade, uniform across the whole of the affected object, and cannot be scratched off with wood or fingernails. Unlike bronze disease, verdigris serves to protect the ...
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.
In Canada, coin roll hunters obtain rolls of nickels, and sometimes dimes and quarters. Dimes and quarters didn't have high mint numbers until silver was discontinued in the middle of 1968. After 1968, coins were minted in very high numbers, making silver coins uncommon, plus the introduction of silver-rejecting bank machines took many silver coin
When casually glancing at a coin, the difference is not easy to tell, but when magnified, the difference is obvious on most coins. Another easy way to tell hub doubling from die deterioration doubling is the presence of notched serifs; the small flairs on the ends of letters will appear distinctly separated with the former, whereas they appear ...