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<p>[QUOTE=&quot;Speedbump, post: 2272686, member: 75637&quot;]Unless you are going to store them in a vacuum, the copper is going to react with carp in the air and change color. Cleaning chemical residue and tap water prolly don&#039;t help any. Copper loves to form compounds with other elements and makes all sorts of colors in the process. Generally, copper does not like to be in its stripped down pure state which is why it can patina relatively fast. The first element copper is likely to react with is oxygen forming copper oxide. This will darken the color or even turn black or red. Other chemical reactions can yield green, blue, and a variety of hues in-between.</p><p><br /></p><p>Is there a specific reason these pennies need to be clean? What level of clean-ness are you after?[/QUOTE]</p><p><br /></p>

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