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What causes pennies to get dirty? | Reference.com


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 ...

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


20 dull, dirty pennies; 1/4 cup white vinegar; 1 teaspoon salt; A clear, shallow bowl (not ... Copper atoms can combine with oxygen atoms from the air to make a  ...

How Do Pennies Get Dirty? | eHow


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 ...


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 ...

Penny Cleaning Science - LoveToKnow


Basically, the experimenter tries to find out which solution will clean pennies best, ... Luckily, it's also the older pennies that are more likely to be dirty. ... to nothing to improve a penny's appearance, taco sauce can cause a vast improvement.

Copper & Kids - Copper Experiments


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 ...

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


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.

Project on cleaning pennies - Finishing


Oh, I have one more question, what actually causes pennies to get dirty? THANKS A BUNCH FOR YOUR HELP! Kalyn [last name deleted for privacy by Editor]

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


Now pour some baking soda into a small dish and add some water to make a thick paste. ... Stir it around to dissolve the salt and then dump in your dirty pennies. .... regular pliers else the penny might become a projectile and cause damage.

How do pennies get so dirty - Answers.com


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 ...

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Chemistry cleans pennies! - Planet Science


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


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!

Chemical Reaction – Penny Cleaner Kids' Blog


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