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Cleaning Copper Pennies

What is a good household item can I use to clean the copper (like pennies)? I heard pennies soak in soda, lemon juice will make them shiny as new, but I tried both, and they just made my dirty cents!...

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Cleaning Copper Pennies Science Project

[mage lang="en|fr|en" source="flickr"]Cleaning Copper Pennies science project[/mage] project to clean copper pennies Science.? Hello. I am really a basic project for my teacher. I try to see if the...

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