How to make dull, old pennies shine like new

Chemical and Material Sciences
Julian Whitney

Debbie Brooks

"1. Testing which non-toxic household products are best at removing tarnish from copper pennies; 2. Coin collecting is a hobby and I am interested in finding the best way to clean coins; 3. Acidic solutions are best at removing oxidation from pennies. The addition of salt to the various solutions proved to be the most effective way to clean the coins; 4. I learned about the chemistry behind how these products work, how mixing certain products can sometimes result in strong chemical reactions, and found that many environmentally friendly ingredients commonly found around the home can be great cleansers. "

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