Penny Cleaning Science
Penny cleaning science projects are fairly popular at grade school science fairs. The reason is
that the chemistry is pretty interesting and the project is easy to do. Basically, the experimenter
tries to find out which solution will clean pennies best, eliminating the copper oxide that gives
the surface a tarnished appearance.
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Penny Cleaning Science Projects Work
To attempt the experiment, the budding scientist needs to gather at least 10 pennies that have a
gray, green or brownish coating on the copper. Pennies made before 1982 work best, since they
are made of solid copper. Newer pennies are made of zinc with a thin coating of copper on top.
Luckily, it's also the older pennies that are more likely to be dirty. (This is not to say that newer
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