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Cleaning old copper coins with vinegar and salt - YouTube

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Cleaning copper spots off my GOLD coin! - YouTube

How to Clean Copper Coins in Seconds: 4 Steps (with Pictures)

7+ Useful Ways to Clean Copper Pennies

Cleaning Copper Pennies With Mouthwash - YouTube

HOW TO CLEAN COPPER COINS - PENNY EXPERIMENT - YouTube

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How to Clean Copper Pennies | Activity | Education.com

Cleaning Copper Pennies With Coke - YouTube