Coins and Paper Money
Chemistry

What makes a penny tarnish?

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2010-10-21 17:28:20
2010-10-21 17:28:20

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.

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A penny does not rust, it tarnishes. But the penny will tarnish.


In the periodic table of Einstein the penny is cleaned by the fruit acid dissolving the copper oxide tarnish the tarnish is then washed away which then shows the true beautiful penny beneath! Or just use sand paper.Also when the acid reacts with the tarnish or whatever you have on the penny the acids reaction is it almost like eats off the tarnish and cleans the penny!


leave it in water 4 a long period of time


With organic matter from fingers (skin oil) sneezing, etc.


Lactic acid cleans the tarnish from copper


Tarnish is an example of chemical change because the oxygen in the air is combining with gold or silver, or whatever the object is made of and makes the 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


Lactic acid cleans the tarnish from copper



The US Mint never issued a 1963 golden penny. Sometime the copper cent can tarnish to a golden hue if it is in the right environment.


Five cents in completely uncirculated condition. If your penny has any type of wear/tarnish/evidence of circulation, it is just worth face value.


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


i found a gold penny once. try scratching off the gold, like i did. the color scratched off easily and the result is a normal penny. But i dont know how they make gold pennys, or the reason More Information: A penny can tarnish to a golden hue. The environment it is in can cause it to tarnish different colors. For example, gold color, blue color, black color, shades of red color. A penny could be gold plated but it would destroy its numismatic value.


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


100 penny makes a dollar. Every penny counts, my friend!


i know a penny can rust, but im not sure what makes a peny rust! i, too, hope to find out!



Soft Drinks Affect Metal By Cleaning it.Ex:If I were to put a penny in Pepsi the tarnish would come off. (Polish the penny.)-Kikiand and it help with the texturen and colorkiki


It does not rust. It oxidizes and tarnishes. The bright red color of clean, new copper will burnish into a dull brown. Look at a penny... a pre 1982 US penny is 95% copper and 5% zinc.


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



Tarnish can be removed from a penny by physical means; however, this tends to damage the coin and would not be an acceptable way of handling antique or valuable items. Tarnish itself consists of a number of copper compounds formed from elements and compounds that copper items come into contact with, even those that exposed only to the atmosphere. Some knowledge of chemistry is important to knowing what these compounds are, and how they might be removed, without damage being done to coins in the process.


No, gold does not tarnish.



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