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How to Clean Copper Coins in Seconds: 4 Steps (with Pictures)
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How to clean copper pennies safely
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Metal Detecting Hack: How To Clean (or ruin) Copper Coins - YouTube
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7+ Useful Ways to Clean Copper Pennies
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4 Ways to Clean Copper Coins - wikiHow
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How to Clean Copper Coins in Seconds: 4 Steps (with Pictures)
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Cleaning dug copper coins. | Coin Talk
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How to clean copper pennies - YouTube
![Cleaning Coins Experiment [Procedure And Explanation]](https://i2.wp.com/www.gallykids.com/wp-content/uploads/2016/05/cleaning-coins-2.jpg?fit=1024%2C512&ssl=1)
Cleaning Coins Experiment [Procedure And Explanation]

Cleaning copper and bronze coins using Ketchup - YouTube