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...
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 ...
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!
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.
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.
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
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
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 ...
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 ...
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.