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<p>[QUOTE=&quot;franke, post: 783242, member: 22161&quot;]Major,</p><p>You seem to be on the right track.</p><p>I ran a test yesterday;not scientific,but careful.</p><p>I took a batch of 24 of my coins,and soaked them in warm water for several hours.</p><p>Then I rinsed all of them from the faucet.</p><p>Half of these were allowed to dry overnight.</p><p>I dried the other 12 coins with canned air.</p><p>This morning,I discovered:</p><p>The 4 coins that were dried with a can that finally expired,left some shiny marks on the high points of some coins.</p><p>The 8 coins dried with a new can of air,all had shiny arks on the high points of the coins</p><p>Strangely,a couple of the 12 coins merely flushed with water from the faucet also had shiny marks.</p><p>I am certain that none of the coins had these marks prior to the test.</p><p>I got the same results with plain water that I got with careful cleaning with a Qtip.</p><p>The new can of canned air was harsher then the Qtips were.</p><p>Frank[/QUOTE]</p><p><br /></p>

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