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<p>[QUOTE=&quot;OldDan, post: 102196, member: 1872&quot;]All I could find out about this stuff is as follows: (I believe somewhere around the early 1950&#039;s)</p><p><br /></p><p>International conservationists directed a scientist from the British Museum to conduct research and find a &quot;preservative.&quot; When he could not find any that met their exacting standards, he created a new one in his laboratory. The revolutionary formula he invented is a semi-synthetic microcrystalline fossil-origin wax entirely free of, damaging acids.</p><p><u>It remains chemically neutral</u> and is therefore completely safe, even on vulnerable surfaces.</p><p><br /></p><p>Like you, I also have heard collectors who aren&#039;t very thrilled with the way the Smithsonian handles their coin collection. But then I got to thinking and came up with the fact that maybe the reason for this feeling is because the Smithsonian isn&#039;t at all interested in selling or having their collection graded by TPG&#039;ers and they never place their collection in those plastic coffins.[/QUOTE]</p><p><br /></p>

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