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What causes pennies to get dirty? | Reference.com

www.reference.com/business-finance/causes-pennies-dirty-a5f49695bbd26892

The dark brown color of a penny is most likely oxidation, which occurs when the copper in the penny comes in contact with oxygen. Since the average penny ...

Chemistry cleans pennies! - Planet Science

www.planet-science.com/categories/under-11s/chemistry-chaos/2011/03/chemistry-cleans-pennies.aspx

Pennies get dull and dirty because the copper in the pennies reacts with oxygen in the air to form copper oxide. When you put your pennies in a vinegar and salt ...

Science Activity: Turn Old Pennies Bright and Shiny! | Exploratorium

www.exploratorium.edu/science_explorer/copper_caper.html

20 dull, dirty pennies; 1/4 cup white vinegar; 1 teaspoon salt; A clear, shallow bowl (not metal); 2 clean ... How did the nail and the screw get coated with copper?

Dirty Pennies | Experiments | Triunfo

cns-eoc.colostate.edu/triunfo/experiments/dirty_penny.html

The pennies are dirty from being used, but there is more causing them to dull. ... But this isn't permanent, you can clean them and make them shiny again!

Why do pennies tarnish, and how? - Finishing

www.finishing.com/168/05.shtml

These oxides are brown or green, and that's what you see when you look at old pennies. The green seems to wear off easier, so that if you find an old penny ...

What Are the Most Valuable Wheat Pennies? | Our Pastimes

ourpastimes.com/valuable-wheat-pennies-5815199.html

Errors make coins valuable, and the rarer the error, the greater the value. In 1922 , the Denver mint stamp did not show up on those pennies, and those that are ...

Why Do Pennies Turn Green? | International Precious Metals ...

www.preciousmetals.com/blog/2015/01/pennies-turn-green/

Place a dirty penny on a clean cloth and rub gently in a circular motion with the ... A 1943 Copper Wheat Penny can get more than $60,000 and one in perfect ...

Chemical Reaction – Penny Cleaner Kids' Blog

www.indypl.org/kids/blog/?p=9577

Nov 3, 2013 ... Find More Science Experiments Everything in the universe is made of teeny ... Dirty Pennies; Taco Sauce; Vinegar; Tomato Paste; Salt; Water ...

Copper & Kids - Copper Experiments

www.copper.org/education/Kids/copperandkids_cuexperiment.html

10 dirty pennies; 4 tablespoons lemon juice; 8 tablespoons vinegar; 1 teaspoon salt; small bowl (not metal!) 1 spoon (not metal!) paper towels or napkins ...

PennyCollector.com - The official website for elongated pennies ...

www.pennycollector.com/tips_clean.html

Now pour some baking soda into a small dish and add some water to make a thick ... Stir it around to dissolve the salt and then dump in your dirty pennies. ... ( The dots you see on the 'After' penny were caused by air bubbles in the lemon juice.