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<p>[QUOTE=&quot;desertgem, post: 1444617, member: 15199&quot;]I do not believe there is any good chemical combination for a dip for any coin except silver coins and it isn&#039;t just the % silver, but also the amount or absence of wear, and the amount of tarnish/toning/corrosion present. IMO, a high content silver coin 90%+ in BU condition is about the lower limit to &quot;expect&quot; a high probability of commercial level success if done properly. High AU, 50-50, and below Au, much , much less. With BU coin such as Mexico 72% silver issues, I have about 50-50, AU, much less. With a 50% silver ( forget what it was, foreign commeratives,etc.) I got 0% success, they all looked bad ( melt). Now throw in amount of tarnish/toning/corrosionand the success ratio on all % of silver drops dramatically. That is why most limit dipping to BU, 90% or better, with light to medium toning. </p><p><br /></p><p>When you get to the lower% silver coins, the other metallic content will not react to the chemicals the same as silver, commonly reacting less and producing microscopic pitting and corresponding loss of lustre.</p><p>IMO</p><p><br /></p><p>Jim<p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p>[/QUOTE]</p><p><br /></p>

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