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<p>[QUOTE=&quot;JamMasterJR, post: 267240, member: 7768&quot;]I gave up trying to clean Lincoln cents.&nbsp; After playing around with cleaning them, I found the results to be unpredictable -- even when the coins are from the same year and mint. I&#039;ve had a few turn out OK but most have been a horrible bluish-purple mess.&nbsp; They do, however, make conversation pieces when I use them to pay for things. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>One problem seems to be due to the fact that the metal composition on Lincoln cents has changed over time.&nbsp; I wouldn&#039;t expect dropping different alloys into identical solutions to produce similar effects. The 1915 and 1995 cents are very different.&nbsp; The 1915 is an alloy of 95% copper plus 5% tin and zinc (I don&#039;t know the percentages of tin and zinc but I&#039;ll bet it varies).&nbsp; The 1995 contains a core of 99.2% zinc and 0.8% copper with a pure copper plating.</p><p><br /></p><p>I&#039;m not a chemist, but my guess is that very slight changes in the structure of the alloy make it very difficult to predict the chemical reactions.[/QUOTE]</p><p><br /></p>

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