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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 ...

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!

CLEAN PENNIES WITH VINEGAR - ScienceBob.com

sciencebob.com/clean-pennies-with-vinegar/

Put about 5 pennies into the bowl and count to 10 slowly. Take out the ... Do other amounts of salt make a difference in the chemistry of the experiment? Science ...

How Do Pennies Get Dirty? | eHow

www.ehow.com/facts_7344498_do-pennies-dirty_.html

Dirty pennies have a variety of causes. penny graph image by RT from Fotolia. com. There are currently over 130 billion pennies circulating in the United States.

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

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

If the eraser is too hard, it can leave deep scratches in the penny. Place a dirty penny on a clean cloth and rub gently in a circular motion with the eraser. Flip the  ...

5 Ways to Clean Your Pennies - Coins - About.com

coins.about.com/od/Start-Collecting-Coins/a/5-Ways-To-Clean-Your-Pennies.htm

Here are five ways to make your pennies bright and shiny again. Not only will you spend ... First, lay your dirty penny on top of a piece of paper or clean cloth.

Chemical Reaction – Penny Cleaner Kids' Blog

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

Nov 3, 2015 ... A chemical reaction takes place that makes a molecule called copper oxide – that is the dirty stuff that you see on the penny. This “stuff” is often ...

Tips For Cleaning Coins: How To Clean The Old, Dirty Coins In Your ...

coins.thefuntimesguide.com/2008/01/how_to_clean_coins.php

The penny looks weird now huh? A dull pinkish color… Now make a concoction out of baking soda and a little water to form a paste. Rub this compound all over ...

HOW DOES ACID AFFECT DIRTY PENNIES? - Finishing

www.finishing.com/81/59.shtml

WHAT DOES THE ACID DO WHEN IT CLEANS THE PENNY? BECAUSE I ... The copper oxide makes the pennies look dirty, but they are really not. When the ...

www.ask.com/youtube?q=What Makes Pennies Dirty?&v=H4N-iGvYrbM
Sep 9, 2012 ... In this video we clean pennies with vinegar and salt. Just mix together some vinegar with enough salt to make a saturated solution. The apply ...
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Science Activity: Turn Old Pennies Bright and Shiny! | Exploratorium

www.exploratorium.edu

Copper atoms can combine with oxygen atoms from the air to make a molecule called copper oxide. The pennies looked dull and dirty because they were ...

Copper & Kids - Copper Experiments

www.copper.org

10 dirty pennies; 4 tablespoons lemon juice; 8 tablespoons vinegar; 1 teaspoon salt; small bowl (not metal!) ... The copper oxide makes the pennies look dirty.

Chemistry cleans pennies! - Planet Science

www.planet-science.com

Dirty pennies; White vinegar; Table salt; Shallow glass or plastic bowl. How to: Put a couple of ... It's the same reaction that makes the Statue of Liberty green!