FETCH! Copper Cleanup
May 6, 2012
Pennies become dull when their surface is exposed to oxygen. See if you can make a penny sparkle with ketchup, baking soda, or cola. Explore whether acids or bases work better at restoring a penny’s shine. Sponsored by Middlesex Savings Bank, with additional support from Red Hat, Inc. © 2011 WGBH Educational Foundation.