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<p>[QUOTE=&quot;desertgem, post: 1748407, member: 15199&quot;]When a dip is mentioned they usually mean an acidic solution of Thiourea. EZest is sulfuric acid and thiourea. The acid reacts with the surface area of the silver coin and an amount is removed to be combined with the thiourea as a soluble compound . Any toning ( usually silver sulfide) is lessened and the coin is closer to &quot;bright&quot;.&nbsp; Repeats will also remove more. Please search out the articles by Doug and also look at the microscopic studies I have done as to the removal of luster that may be present if overdone. It can not be reversed. It may retone, but any luster lost is LOST. See the microscopic photos of the surfaces.</p><p>&nbsp;</p><p>Since it is a straight chemical reaction, it can be done more times with a diluted solution and have the same end result. My suggestion ( If you decide to do it) is to dilute some &#039;Dip&#039;&nbsp; with water by a factor of 1:5 or 1:10 parts water and dip for a few seconds until you gain the experience&nbsp; of an end point and rinse well with water and then acetone to remove all water and put in a &#039;toneless&#039; place. The silver surface of a fresh dipped coin is very very reactive as no patina has developed. A previously dipped coin or one below AU can well turn out with no luster, just a fakey looking bright facade.</p><p>&nbsp;</p><p>Any use of Acetone, Xylene, etc. should be done in an open flameless area as they evaporate quickly and are quite flammable. Do not do around gas water heaters or pilot lights. IMO.</p><p>&nbsp;</p><p>Jim[/QUOTE]</p><p><br /></p>

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