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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 ...

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!

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 ...

How to Clean and Polish Dirty Pennies (The Chemical Free Way)

www.instructables.com/id/How-to-Clean-and-Polish-Dirty-Pennies-The-Chemica/

How to Clean and Polish Dirty Pennies (The Chemical Free Way) ... -You could get a better shine with chemicals -It would be faster ... On my shiniest pieces, I use silver polish (not copper polish, it is abrasive and will cause scratches). Voila! a ...

H.I.P. Pocket Change™ Web Site - Inspector Collector's Coin ...

www.usmint.gov/kids/campCoin/collectorsWorkshop/coinCourse/04.cfm

Coins for collections should be free of fingerprints, even if you can't see them. ... Another reason to keep coins from getting dirty is that coins are very hard to ...

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 ...

How do pennies get so dirty - Answers.com

www.answers.com/Q/How_do_pennies_get_so_dirty

Yes, the tarnish is copper oxide. But actually the tarnish is not from when the pennies are made (brand new pennies are shiny); the tarnish is from.

How does coins get dirty - Answers.com

www.answers.com/Q/How_does_coins_get_dirty

That's why pennies turn brown and dollars go from a shiny golden color to a sort of antique .... Obviously dogs make messes and like to get into potentially dirty things (e.g. ... But being in captivity can cause a build up of oils and dirt on their fur.

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.

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.

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

www.exploratorium.edu

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?

How Do Pennies Get Dirty? | eHow

www.ehow.com

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.

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

coins.thefuntimesguide.com

Only low-grade extremely dirty coins will benefit from a good cleaning. Medium- and high-grade coins will actually go down in value if you attempt to clean ... this solution on the pennies — combined with oxygen — will cause another reaction.