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<p>[QUOTE=&quot;desertgem, post: 652450, member: 15199&quot;]Well, there are some facts, just due to real life chemistry, about any substance that can affect the metallic surface of the coin. Such as the fact that chemical dips contain acids, even if they aren&#039;t the strong acids, that react with toning, corrosion, patina, virgin metal, to do what they are intended to do. Another fact is how much of the original flow lines and luster is there before dipping, and how much will be left. Those are facts. The experience ( or practice if you prefer) has to somehow estimate those factors, and I know no algorithm which could be used. One needs good estimates to begin. Then the opinions are what dilution ( if any), how long, how to neutralize or rinse the acid off best, how to preserve the activated surface from the &quot;uglies&quot; after a period of time, etc.</p><p><br /></p><p>So I see </p><p><br /></p><p><b>Facts. Experience, Opinion.</b>&nbsp; <b>Facts</b> you can get in references, <b>experience</b> has to be gotten by practice, trial and error.&nbsp;&nbsp; <b>Opinions</b> are the difficulties because no set of conditions are the same when different people dip a silver coin. This makes most people opt to not express opinions on subjects they fear will be misinterpreted.</p><p>IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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