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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...

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 ...

From Dull to Dazzling: Using Pennies to Test How pH Affects ...


Pennies are bright and shiny when they're new, but become quite dull with time. What causes such a drastic change? Oxygen in the air ..... GET INVOLVED.

Cleaning Pennies From 1950's - Finishing


In October---, you said that today, pennies are copper plated zinc. ... And also what causes them to get dirty and what is the dirty stuff on the surface of the penny ...

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]

www.ask.com/youtube?q=What Causes Pennies to Get Dirty&v=kufXLB1GF94
Nov 6, 2012 ... Clean all your dirty cents or any copper metal using vinegar and salt Music: ... I'm sure you can get more than 2 antique pennies from the jar.

Penny Tarnish Reverse Projects | The Classroom | Synonym


Because pennies are made of copper, they don't actually rust. ... What Causes Copper to Tarnish? How to Get Tarnish Off of a Gold Necklace · How to Trade Penny Stocks for Beginners · The Do's & Don'ts of Buying Penny Stocks ... remove the copper oxide -- the cause of their dark and dirty appearance -- from ...

Re: What is in Coca Cola that cleans pennies so quick and well???


Mar 20, 2000 ... Why does Coca-Cola make a penny bright and shiny? Briefly, the phosphoric ... What can you do to get rid of the oxide layer? You can polish it ...

Penny Experiments - Lettice Bell


How many pennies can you put in a full glass of water? How can ... Question: How would you get a coin out of a dish of water without touching the water or ... 20 dirty pennies .... Spinning the pennies causes the center of gravity to be located.

Penny Cleaning Science - LoveToKnow


Luckily, it's also the older pennies that are more likely to be dirty. ... To get rid of this dull and often greenish substance, an acid needs to bond with the oxide and  ...

Helpful Resources

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 metal); 2 clean ... How did the nail and the screw get coated with copper?

Dirty Pennies | Experiments | Triunfo


Have you ever seen a penny that was so dirty it was black or green instead of copper? The pennies are dirty from being used, but there is more causing them to  ...

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.

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 ...

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 ...