Cleaning Copper Coins - Tutorial, page 5
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How To Enhance Copper Coin Features and Improve Coin Appearance
6) Enhance Coin Features with Eraser
As all my coins have turned dark-blue in the tarnishing compound, their features are barely visible. The best means of enhancing coin design is to apply a hard erasing rubber with an edge. Sometimes I use erasers of different shapes and hardness in order to enhance either all coin features at once or one feature at a time. NOTE: The hard erasers should not be applied to a coin with smooth and shiny surface because they will leave a zillion of microscopic scratches on it; thus, ruining it completely.
Rubbing the Coin with Eraser
Finally the coin's design "comes forward", and the coin is ready to be displayed.
Obverse of 1750 Denga Coin Before and After Enhancing Its Features
The rest of the coins were treated the same way, and they all came out nice, considering their condition. Because copper retarnishes very quickly, the features of any copper coin that was treated by this method will darken over time.
To preserve the appearance of your coin, you may want to cover it with oils that are especially designed for preserving coins. If such protective oil (sold in any coin collector's shop) is not readily available, you can "shield" your coin with mineral or olive oils (you can find more information on preservation of coins here). If you do not want to bother with "oiling" the coin, its appearance can be easily restored by rubbing the coin with a soft eraser every now and then.
Same Coins (shown on page 3) After Being Patinated and Rubbed with Eraser
If you would like to learn the professional methods of cleaning copper coins and enhancing their appearance, please visit this page.
To learn my simple and quick method for cleaning silver coins, please visit this page.
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A Complete Guide to Coin Cleaning
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