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WATER is one ENEMY of Copper COINs
If you look closely at the coins above, you will see all of the green
and whitish corrosion that is most likely caused by water (among other
things). Over long periods of time, exposure of copper to water
can result in corrosion caused by the interaction of the water itself
but also in part do to the particles contained within the water. The
following pictures show copper pipes in a home that have the exact same
type of corrosion caused by pinhole leaks exposing the outside of the
copper pipe to the water.
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Example of water damage to copper pipe from pinhole leak that has dripped.
Example of water corrosion from a pinhole leak that has run along the copper pipe.
Example of corrosion where water has leaked from a coupler-fitting and collected on pipe.
Example of corrosion by water from a pinhole leak that has spread along the copper pipe.
Of course there are all kinds of other ways that our wonderful
copper
coins can be damaged, but a lot of the corroded pennies we encounter
have either been exposed to water outside (laying on street or ground).
Just remember that when it comes to water, the point is to keep your
copper coins dry so when storing your copper coins, you need to ensure
they are in a dry
environment.