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<p>[QUOTE=&quot;hotwheelsearl, post: 4771481, member: 75143&quot;]I am still unconvinced that any coin 2000 years old could have avoided all traces of oxidation.</p><p><br /></p><p>I mean, look at American 90%, or even 40% silver coins from the last 60 years. The vast majority of those coins exhibit some level of oxidation.</p><p><br /></p><p>It&#039;s incredibly inconceivable to me that 2000 years of various environmental conditions could ever lead to high-purity silver coin with NO oxidation whatsoever.</p><p><br /></p><p>As I stated in an above comment, the oxidation of Ag with O is a <i>spontaneous</i> reaction and will occur, <i>no matter what</i> if there is even a tiny bit of oxygen in the environment.</p><p><br /></p><p>Any coin in a vessel and underground is surrounded by soil, dirt, or other materials that are <i>porous</i> - they let oxygen through. </p><p><br /></p><p>You see, even if you sealed a coin in a hermetically sealed jar, unless it was vacuum-sealed there would be enough residual oxygen in the jar to produce <i>some level of oxidation</i>.</p><p><br /></p><p>TLDR: it&#039;s probably chemically impossible for a 2000 year old coin to have never experienced oxidation.[/QUOTE]</p><p><br /></p>

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