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<p>[QUOTE=&quot;desertgem, post: 833869, member: 15199&quot;]<p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000">Charmy, copper is not porous, unless specifically manufactured as such ( and it is for certain purposes, but striking would destroy it). Any porosity is due to environmental activity on the new surface, and there is no way ( IMHO) to condition or alter the metal itself. The oil substance just covers the surface of the coin, and in some cases the corrosion material. Does it protect ? probably in the beginning, but eventually any kind of oil except maybe pure synthetic oil ( haven&#039;t seen much research on it ) will produce or absorb environmental gases. Not as much as water moisture, but more than the bare patina. Is it worth arguing over for circulated copper coins that already have damage ( from wear) on the surfaces~ probably not, but my opinion for what it is worth is that no oil is better.</span></p> <p style="text-align: left"><span style="color: #000000">Respectfully,</span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000">Jim</span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p>[/QUOTE]</p><p><br /></p>

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