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<p>[QUOTE=&quot;kaparthy, post: 19864, member: 57463&quot;]The world has changed since 1960.&nbsp; Speaking of cleaning coins with a pencil eraser, this was the approved method of improving coins back about 1930-1960.&nbsp; (I believe that Wayte Raymond recommended this in is newsletters.)&nbsp; Before that, collectors painted their coins with shellac.&nbsp; It comes off now without damaging the surface, actually preserving the coin, in fact.&nbsp; We do not do this any more, either.&nbsp; </p><p><br /></p><p>Baking soda is not a good idea.&nbsp; </p><p><br /></p><p>We like original surfaces.&nbsp; Even &quot;old cleaning&quot; (and resultant retoing)lowers the price of a coin compared to an uncleaned example.</p><p><br /></p><p>As for gun oil, etc., on copper coins, this is debatable.&nbsp; Again, the easiest path to virtue is to never clean a coin.&nbsp; That said, people who have been at this a while -- and mean serious numismatists who own businesses, publish articles and books, serve on boards, etc. -- will allow that xylol (xylene and alcohol) do not damage a copper coin.&nbsp; Copper is the kind of metal that can react favorably with lubricants.&nbsp; However, it is pretty easy to tell from arm&#039;s length when this has been done.&nbsp; The coin looks shiny and new and yet has its details missing.&nbsp; </p><p><br /></p><p>Michael[/QUOTE]</p><p><br /></p>

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