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<p>[QUOTE=&quot;Mac McDonald, post: 7683946, member: 117420&quot;]To clarify, there is not a &quot;film&quot; applied to the surface of, and/or around, the coins when minted, at/by the mint, etc...and so a &quot;film&quot; cannot be removed if not there in the first place.&nbsp; But luster can be, because it is.&nbsp; There were a lot of references to &quot;improperly cleaning&quot; coins removing this mystery &quot;film&quot;...but properly cleaning coins will <u>not</u> remove it...???&nbsp; Each reference seems to say/suggest something similar by implication.&nbsp; So, what is the difference between &quot;improperly cleaning&quot; and properly cleaning...so that luster remains...?&nbsp; If y&#039;all are talking &quot;improperly cleaning,&quot; then there must be a properly cleaning...right...?&nbsp; Understand the compromising of luster (the &quot;film&quot;) by various exposures, to include various cleaning processes...but only by <u>im</u>proper and not proper cleaning...? Proper cleaning...?[/QUOTE]</p><p><br /></p>

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