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<p>[QUOTE=&quot;Sallent, post: 3198423, member: 76194&quot;]A gentle 2 parts distilled water and 1 part ammonia mixture would be my #1 recommendation before any acids too. Please make sure the water is distilled and not tap water . You can buy a gallon of distilled water at the store for $1 and ammonia at Home Depot or another hardware store.</p><p><br /></p><p>Ammonia should be safe on Roman silver up to around 250 CE. Anything newer (ie. billon coins) or bronze coins require a different method. The ammonia is only for 40%+ silver content Imperial coins. Avoid ammonia for provincials as some &quot;provincial silver&quot; may actually be billon.[/QUOTE]</p><p><br /></p>

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