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<p>[QUOTE=&quot;desertgem, post: 538894, member: 15199&quot;]Most lighter fluids main components are Naptha octanes and nonanes. These are liquids at room temperature and not to be confused with butane (gas) lighters which are much more common these days. These are slightly larger molecules than the hexanes/heptanes which were/are used to immerse stamps to look for a watermark. Being heavier, they evaporate more slowly and thus the reason the coins looked different for a while.</p><p><br /></p><p>I think that pure acetone has less problems both chemically and healthwise, and I would recommend over the lighter fluid. Many stamp collectors, myself included have used Ronson ( preferred brand) for watermarking, and they give much more of a headache or respiratory problems. They are used because they will stay liquids longer to find the elusive watermark.</p><p><br /></p><p>The use of acetone is called &quot;cleaning&quot;, but I don&#039;t feel it is appropriate due to common useage of the term normally involves physical action or chemical reaction with the coin.....which acetone does not do, only with organic material on the coin. I feel it is properly conservation. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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