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www.ask.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 circulates for 25 years, a...

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!

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.

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

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

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.

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

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

The way I polish pennies uses the same concept, but is much more faster. ... - Messy -You could get a better shine with chemicals-It would be faster with ... ... pieces, I use silver polish (not copper polish, it is abrasive and will cause scratches).

How do pennies get so dirty - Answers

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 the copper of ...

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 ...

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 does coins get dirty - Answers.com

www.answers.com/Q/How_does_coins_get_dirty

Coins are used by people, and no matter how well you wash you still have oils and acids ... Hobbies & Collectibles > Coins and Paper Money > How does coins get dirty? .... But being in captivity can cause a build up of oils and dirt on their fur.

Popular Q&A
Q: What causes a penny to get rusty?
A: If i remember rightly, rust is just a metal oxide. So on a coin it would be copper reacting with the air, albeit slowly, forming copper oxide. Read More »
Source: wiki.answers.com
Q: What is causing it to get so dirty so quick?
A: Hello Minden- What size of tank are they each in? Smaller tanks need water changes fairly frequently, whereas larger tanks may go through a cloudy phase before ... Read More »
Source: en.allexperts.com
Q: What would be the cause of a brown freckle rash which gets more d...
A: Check out Mastocytosis online - it can cause a rash that looks like freckles. Try Googling Schamberg's disease.it sounds like this may be it? Hope it helps. I h... Read More »
Source: www.answers.com
Q: What do I do in order to get my bronze/penny colored hair to a di...
A: the color on the box will always come out darker then expected.so i would recommend getting two shades lighter then you actually want. trust me! i have been dyi... Read More »
Source: answers.yahoo.com
Q: What could cause this, and is it going to be a pretty penny to ge...
A: spindle wont budge? spindle is in the front. do you mean the axle wont turn? that means the differintial needs to be rebuilt or a salvage yard replacement. one ... Read More »
Source: answers.yahoo.com