Coins and Paper Money
Chemistry
US Coins

Why do pennies tarnish?

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2008-10-22 13:31:53
2008-10-22 13:31:53

Tarnish (AKA toning) is caused by exposure to air, chemicals, and/or dirt & oils from human fingers. A chemical reaction causes oxidation of the metal and the change in color. The same thing happens to silver coins. OMG

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Related Questions


darker soft drink will remove the tarnish form the pennies

Oxidation and corrosion tarnish pennies

Damp conditions tarnish copper and bronze pennies quickly. Bleach can also tarnish them.

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

Pennies and the Statue of Liberty are both made of copper but the Statue of Liberty is now green just like pennies become, although they are shiny when they're new. So copper is the metal that has green tarnish.

By removing some of the copper on the tarnished penny. when tarnish sets on a penny it becomes dull and loses it shine .the acid which acts like a cleanser takes off the build up of tarnish and brings back the shine of the copper that pennies are made of

They are copper and if soaked in vinegar the tarnish will come off and they will shine again.

Bacteria and oils from being handled by people. Tarnish on the copper part of the penny.

Vinegar is a mild acid. It will remove light oils, dirt and tarnish without significant damage to the base metal.

it depends on what you try to clean it with, things like lemon juice may work but im doing an experiment to find out what cleans pennies the best Im doing one too, and I read that pennies lose tarnish faster when you mix salt in lemon juice, or any other mild acid. It creates a sort of hydrocloric acid that cleans the tarnish right off. It also explains why your stomache hurts if you chug too much beer salt x.x -Aflay

The copper in the pennies reacts with the air and forms copper oxide, which is greenish in color. It is a slow process and can be reversed by cleaning the penny with an acidic solution.

Pennies are made of zinc plated with copper. Copper reacts with oxygen and water to form copper oxide. This is the tarnish you see on pennies that have been in damp conditions. The only U.S. coins that can truly rust are the 1943 zinc coated steel cents.

No, gold does not tarnish.

Copper, silver, and brass tarnish.

The word "tarnish" in the sentence "the silver will tarnish if it is not polished often" is a verb. It is describing the action of the silver in the sentence.

yes it can tarnish very well if not protected

Tarnish is oxidation caused by exposure to air.

Another word for tarnish is destroy.

No gold does not tarnish. however, it is quite soft.

why silver jewellery tarnish with lime?

yes because it is a metlollied and all metloilleds tarnish


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