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<p>[QUOTE=&quot;desertgem, post: 521224, member: 15199&quot;]Maybe a small discussion of oil would be appropriate. Oil and its derivatives and coal derive from organic origina which have proteins. Certain amino acids in proteins have Sulfur atoms in the structure. Some deposits have a larger proportion of sulfur compunds in the &quot;crude&quot; than other deposits. Never the less, sulfur is there. When distilled, there is still sulfur there, which is one of the reasons why burn emissions are monitored. Now it is true that some processes have been developed to try and remove the sulfur, but much of corrosion of metallic distillery pipes, etc. is due to the sulfides and other sulfur products that is in the products. So no matter how well refined, nor the lightness of the oil, there will be sulfur present. It is protective as far as prevention of oxygen and moisture from reaching metal surface, but it can produce chemical corrosion. Just much slower than if water and oxygen was also present with the sulfur compounds. Synthetic oils are generally synthesized without any sulfur compounds, so its effects on corrosion has been considered to be superior, but no studies on coin preservation are found.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" /></p><p><br /></p><p>Regular organic oil products can be broken down into water soluble acidic compunds by certain microorganisms&nbsp; ( basis of oil breakdown in oceanic water by barriers), which cause no harm in the sea water due to dilution, but the acid on the coin surface could reasonably cause corrosion.So microorganisms in the environment can affect the corrosion rate.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" /></p><p><br /></p><p>Any other chemistry people can add or correct any error of mine.:kewl:</p><p><br /></p><p>Thanks </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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