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The first reason is that the copper oxidizes. That gives them a dirty or dark look. This is caused by the oils from the hands of people that handle them. Other things would include being dropped onto the ground and all sorts of substances. Contact with dissimilar metals can cause corrosion as well.

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Q: Why are there dirty pennies?
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Related questions

How do you make pennies dirty?

Well pennies are already dirty from other peoples germs including yours but you would probably put it in dirt to make it dirty.


How does pennies get dirty i love jack dunn?

they get so dirty because they traval around the world and you can have pennies from 156 years ago


How do you clean dirty pennies with Pepsi?

you cant because Pepsi is sticky


Do pennies ever get dirty?

Pennies do get dirty. They are dropped on the ground and transferred through many hands. Money is often full of germs, so it is best to wash your hands after handling it. This is another reason people use debit cards.


Why does orange juice cleans dirty pennies?

Because the acid contents within the juice


Can ginger clean pennies?

yes. for my brother's project we put dirty pennies in ginger ale, cola, and sunny D and Ginger Ale cleaned it the best


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 the penny reacting with the oxygen in the air over time.The article I have given a link for is quite funny, but it also very informative as regards to pennies, so you might want to check it out.plz decuse the reason why tarnish gets on pennies


What kind of dirt gets onto pennies?

Dirt that gets onto pennies can come from various sources such as handling the coins with dirty hands, exposure to elements like moisture or humidity, or being in contact with other dirty objects or surfaces. Over time, the dirt can build up on the surface of the pennies, giving them a grimy or tarnished appearance.


Why can drpepper and sprite clean dirty pennies?

Dr Pepper and Sprite contain acids that can dissolve the oxidation on the pennies, making them appear cleaner. The acids in these beverages break down the tarnish or grime on the pennies, revealing the shiny copper surface underneath.


What is the result of placing pennies on a paper towel and pouring salt and vinegar over them?

salt and vinegar will make dirty coins brighter you shouldn't do this with a valuable coin


Where can you buy pennies and pennies and pennies and pennies?

the bank!


Why is water able to clean dirty pennies?

Water is a very good solvent, which dissolves lots of things, and even things that it does not dissovle can often be physically washed away, with water.