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<p>[QUOTE=&quot;Leadfoot, post: 1118156, member: 2972&quot;]Time plays a role, but as was alluded to above, environment plays a more fundamental role into why your 2009 coin is toned.</p><p><br /></p><p>Do this experiment.&nbsp; Take three new pennies and a fresh box/pack of matches.&nbsp; Place one coin inside the matchboxes. Place the other two of them on a shelf in your bedroom -- a bookshelf is fine.&nbsp; Every day for a two weeks, simply handle ONE of the coins.&nbsp; Handle the same one every day.&nbsp; Every time when you put the coin back look at the color difference between them, and at the end of two weeks also compare the coin in the matchbox.</p><p><br /></p><p>You will have the answer you seek.</p><p><br /></p><p>As an interesting sidebar, take the three pennies and put them in a pocket of a piece of clothing (preferably one you can close completely).&nbsp; Now, wash the clothes and pennies - a full wash cycle.&nbsp; Look carefully at what results.&nbsp; You might notice a blue coloration that appears only in certain areas of the three coins that were &quot;browned&quot; before, but do the experiment yourself and observe carefully what you find.&nbsp; Now place the same coins in the dryer with the wet clothes (you might even try no, low, and high heat) and compare again.[/QUOTE]</p><p><br /></p>

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