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What Cause These Strange Marks On This Washington Virginia State Quarter

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Pillar of the Community
mklpatrick's Avatar
United States
580 Posts
 Posted 01/07/2009  7:21 pm  Show Profile   Bookmark this reply Add mklpatrick to your friends list Get a Link to this Reply

Quote:
...but what is making them visible is probably a slight non-homogeneous alloy and some environmental contamination that is helping to make the excess copper areas more visible. (The excess copper areas react more creating light and dark streaks.)


So what would an example be of the environmental contamination? Perhaps a chemical with which it came in contact at one time?
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coppercoins's Avatar
United States
7629 Posts
 Posted 01/08/2009  09:20 am  Show Profile   Bookmark this reply Add coppercoins to your friends list Get a Link to this Reply
Or rusty water, or ground dirt like clay, or that it sat in a container that had liquid spilled into it and left to dry. A vast number of possibilities exist. The exact cause will most likely always remain a mystery, as is the case with most environmental contamination.
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