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<p>[QUOTE=&quot;cladking, post: 4592947, member: 68&quot;]Mint set packaging is four layers and the layers touching the coins is soft &quot;plastic&quot;.&nbsp; </p><p><br /></p><p>The coins will tarnish if left in this packaging.&nbsp; After they begin tarnishing many of them can be saved with a soak.&nbsp;&nbsp; However, in time there is nothing that can be done.&nbsp; </p><p><br /></p><p>I&#039;d guess most mint sets are already damaged and more than 75% of some of these can not be saved.&nbsp; &#039;68-P pennies are the worst with virtually all of them in the plastic being severely damaged and those that were removed are usually carbon spotted.&nbsp; </p><p><br /></p><p>It doesn&#039;t really seem to matter because no one is collecting moderns.&nbsp; The few who do don&#039;t mind tarnish and carbon spots.&nbsp; After all these years there might never be any real demand.&nbsp; But if everyone with bad &#039;68 cents tried to replace them with good ones there would be a big surprise.&nbsp; A lot of &quot;common&quot; high mintage moderns from the US and world are scarcer than most of the old &quot;key dates&quot; in chBU.&nbsp; In all these years I&#039;ve seen only a single Gem &#039;82 quarter and a single Gem &#039;84-P cent with good surfaces.&nbsp; Gem &#039;69 quarters were tough in 1969, nobody saved them, and now most of the mint set coins have been destroyed by the packaging.&nbsp; </p><p><br /></p><p>I&#039;ve never found anything that can restore tarnished mint set coins.&nbsp; The tarnish can be stripped off with good ammonia but the coin looks cleaned most of the time.[/QUOTE]</p><p><br /></p>

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