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<p>[QUOTE=&quot;lawdogct, post: 58801, member: 1476&quot;]Sinter basically means &quot;burnt&quot;.&nbsp; When the coin planks &quot;planchets&quot; are made, as mentioned they are anneals, which is a heating process to temper/harden the medal of the planchet.&nbsp; Copperwashing is different.&nbsp; I&#039;m editing this post b/c I&#039;ve just learned more about it from another post by MikeDiamond.&nbsp; Here&#039;s what he had to say about copperwashed coins:</p><p><br /></p><p>&quot;A &quot;copper wash&quot; error is said to occur in the chemical rinse bath, which is a step after planchets are annealed (heated). If the solution is saturated with copper ions, those copper ions can attach themselves to the surface of subsequent batches of coins. So goes the theory, anyway. Problem is, there hasn&#039;t been an obvious source of free copper ions since the mint did away with copper-alloy cents. Perhaps copper ions are preferentially liberated from the surface of clad coins and then re-deposited on later clad coins.&quot;</p><p><br /></p><p><br /></p><p><br /></p><p>Anyway, verified sintered coins can be worth quite a premium, so take care not damage or get prints on the one you&#039;ve found until you can get it certified.</p><p><br /></p><p>Hope this helps.[/QUOTE]</p><p><br /></p>

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