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<p>[QUOTE=&quot;BadThad, post: 803858, member: 17261&quot;]Conservation (market acceptable) - Using techniques to enhance appearance without damaging the surface.</p><p>&nbsp;</p><p>Cleaning (unacceptable) - Using techniques that permanently damage the surface; therefore, significantly reducing the numismatic value.</p><p>&nbsp;</p><p>Once you cross the line from conservation to cleaning there is no turning back.</p><p>&nbsp;</p><p>Always following the solvent polarity ladder when attempting conservation:</p><p>&nbsp;</p><p>1) deionized water</p><p>2) acetone</p><p>3) xylene</p><p>&nbsp;</p><p>This range covers from polar to non-polar and should remove most surface debris. Sometimes reversing the process (i.e. starting with xylene) proves successful too. For an amateur, going beyond soaking in these solvents is &quot;dangerous&quot; and will likely result in a cleaning.[/QUOTE]</p><p><br /></p>

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