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<p>[QUOTE=&quot;desertgem, post: 3929959, member: 15199&quot;]EZ-est also has thiourea which is a chelating agent to break up the silver tarnish and carry it away from the silver. Unfortunately this reaction requires an acidified solution to work and the concentration of acid in the solution is intended to make it &#039;fast&#039;. Dilution of the acid slows it down significantly and allows better control.</p><p><br /></p><p>Straight acid does not do that, so the tarnish loci can reattach in the smaller depression. IMO, Jim</p><p><br /></p><p>Damn Jeff, you are fast. Should be a moderator!&nbsp; Jim[/QUOTE]</p><p><br /></p>

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