In her series, "Tondi observations," contemporary artist Jacqueline Lou Skaggs paints miniature oil paintings on the copper surface of discarded U.S. pennies. Interestingly, as she points out in her description of the series, her actions elevate the value of the coins while simultaneously defacing them.
Pennies How to Change Color of Pennies Pennies, 1/4 c white vinegar, 1 tsp salt, A clear, shallow bowl (not metal), Paper Towels. Mix salt vinegar in bowl. Stir til salt dissolves. Add pennies. After 5 min, take out half of pennies; Put on paper towel. Remove rest of pennies. Rinse them really well under running water, put on a paper towel. In abt 1 hour rinsed pennies will look shiny and unrinsed pennies will be coated with a blue-green compound called malachite.
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