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<p>[QUOTE=&quot;Sallent, post: 3500733, member: 76194&quot;]The primary reason not to expose a silver coin to lemon juice longer than necessary is leaching. Prolonged exposure will leach the impurities out of the silver (coins are&nbsp; not pure silver, and have copper mixed in) . Overexposure to acids will turn a coin porous and fragile, and ugly to boot. When cleaning ancients, it&#039;s always best to be conservative even if it takes longer. You only get one chance to do it right, and it&#039;s not like they are minting more of these coins as we speak.[/QUOTE]</p><p><br /></p>

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