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<p>[QUOTE=&quot;davidh, post: 548152, member: 15062&quot;]Questions have been asked about the best ways to clean coins.&nbsp; Looking at the issue from the other end of the spectrum I decided to test the worst ways to clean.&nbsp; I took four average brown 1950s Lincoln Cents and used four methods to clean them.&nbsp; </p><p><br /></p><p>The 1952 was cleaned by blasting it with a 3 to 1 mixture of glass beads and aluminum oxide.&nbsp; The 1955 was cleaned with a wire brush in a Dremel tool running at 20,000 RPM.&nbsp; The 1950S was given a 5 minute soak in a 32% solution of Hydrochloric Acid.&nbsp; Finally, the 1956 was soaked for 5 minutes in Sodium Hydroxide.</p><p><br /></p><p>The glass beads took off all the dirt and corrosion but left the surface with a heavy matte finish.&nbsp; The wire brush/Dremel made it nice and shiney but left a lot of little scratches on the surface. The HCl ate into the copper but left a bit of dirt/corrosion unaffected.&nbsp; The NaOH did little in the way of cleaning but it seemed to leave the appearance of verdigreen where there was none to begin with.</p><p><br /></p><p>Conclusion: None of these methods appear to provide an acceptable result.</p><p><br /></p><p><img src="http://www.geocities.com/dyouse2000/tempix/IMG_0619.JPG" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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