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<p>[QUOTE=&quot;rlm&#039;s cents, post: 833095, member: 7957&quot;]You 2 are saying the same thing if you could just say it in the same language.&nbsp; Yes, oils are hydrocarbons.&nbsp; However, they also &quot;contain trace elements such as sulfur, phosphorus, chlorine, etc.&quot;&nbsp; When you oil the coin, these oils stay on the coin and eventually the trace elements start reacting with the coin.&nbsp; Xylene (toluene also), and acetone are also hydrocarbons (solvents), but they are not oils.&nbsp; They likely contain the same trace elements, but they are extremely volatile.&nbsp; When the coin is removed, these solvent evaporate (including the trace elements) leaving nothing to react with the coin&nbsp; Thad uses these solvents to remove any oils that may be on the coin.[/QUOTE]</p><p><br /></p>

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