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<p>[QUOTE=&quot;Sallent, post: 2939563, member: 76194&quot;]Let this be a lesson to all the quacks that promote cleaning ancient silver with lemon juice and other acids. When dealing with ancient coins, you have to be very gentle. Acids should always be a last resort, and when used, require constant supervision to avoid damage. Leaving a coin soaking in any acid for any significant time, even a mild one, is a recipe for disaster.</p><p><br /></p><p>Always try distilled water, then acetone, and if something stronger is required, try Verdicare...or even prolonged soaks in olive oil, and if that doesnt work and the coin has a 50% or higher silver content then move to 1 part ammonia and 3 parts distilled water (or another gentle substance like the one andres2 used) and only soak for a brief few minutes at most (when in doubt, pull the coin out, examine for any adverse reactions, and then determine if further soaking is needed).</p><p><br /></p><p>(Warning, Potin coins should never be exposed to Ammonia, so avoid cleaning provincial coins with that method).Avoid cleaning any bronze or debased coinage with it too.</p><p><br /></p><p>Any mild acids should be a last resort on the coin, and it should only be exposed to them very very briefly and the acid must be neutralized.</p><p><br /></p><p>Hopefully this lesson keeps other coins from being ruined. Also, I would have left OP coin in its original state as it was already a problem coin with crystallized surfaces. Some coins should just never be messed with.[/QUOTE]</p><p><br /></p>

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