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<p>[QUOTE=&quot;rmpsrpms, post: 3447177, member: 31773&quot;]I remember doing an experiment about 10 years ago, which I published on another forum, where I used a coin dipping solution (EZest I believe) to do a quick dip on a toned AU Kennedy half. I went through the recommended procedure, following up with final clean distilled water rinse. I then ran a very small amount of clean distilled water over the coin and onto a mirror, and let the water dry. It was shocking how much residue (presumably from the dipping solution) was still present on the coin after the normal rinses. I&#039;d expect this residue to cause the surface to be unstable, and tone in ugly ways over time and under the right conditions. This is why I don&#039;t personally recommend ANY sort of rinse, and especially not a dip.</p><p><br /></p><p>Edited to add: I do think that the pure distilled water rinse should be OK. It won&#039;t on its own leave any residues, so all it can leave is what&#039;s already on the coin.[/QUOTE]</p><p><br /></p>

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