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Cleaning chemistry

To make it into an investigation:
Will other acids/ liquids (lemon juice, orange juice, lime juice, tomato ketchup) work as well?
Does this cleaning chemistry work on other coins?
Does other amounts of salt affect the cleaning process?
Does the cleaning chemistry work quicker in warm water?


This is a really quick experiment on how to clean dirty pennies.

Still image for this video

Here are instructions on how to clean pennies.