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<p>[QUOTE=&quot;mrbrklyn, post: 101793, member: 4381&quot;]Numismatic experts can pounder this all they want, but there is a simple chemical truth involved.&nbsp; The chemicals ***remove*** metal and metal oxidates from the coin.&nbsp; This is damaging the coin.The funny thing reading the NCG writeup is that they said it was irresonsible to leave a painting, barely seeable, under a dark old varnish.&nbsp; However, they were wrong that all institutions always remove this varnish.&nbsp; In fact, this is a huge problem with several Rembrandts at the Met and Frisk museums.&nbsp; Rembrandt painted them using heavey varnish as part of his technique.&nbsp; Its not readly possbily to lift the varnish and retore the painting.&nbsp; Even works like &quot;The Polsih Rider&quot; are under attack.</p><p><br /></p><p>The first rule of restoration, which is not is being discussed here, and not preservation, is that any tampering with the object damages the object.&nbsp; Proper resotration does two things.&nbsp; First it does the least damage possible to the object, and secondly recreates something that was missing from the item.</p><p><br /></p><p>In a word, an expert in this area, should be even more sensitive about giving advise to a lay person on the web about cleaning a coin, or encouraging someone to take it upon themselves to clean a coin which is not fundementally damaged.</p><p><br /></p><p>I base this opinion on hard facts, and not emotional attachment, political objective, business interst or any personal feelings.</p><p><br /></p><p>Ruben[/QUOTE]</p><p><br /></p>

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