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<p>[QUOTE=&quot;H8_modern, post: 1449298, member: 28531&quot;]Picked up an old half cent that has been cleaned sometime in the last century or so. The high points are gold/brassy and I&#039;d like to return them to chocolate brown but I want to do it properly. I understand the Smithsonian does something with the coins from their collection that have been cleaned in the past to allow them to re-tone naturally. Does anyone know their process? Temperature, humidity, sunlight? I once purchased a BU merc mid-day and by the time I got home that evening sunlight had turned the bottom 5% of the coin black(It must have been trying to get out of the envelope). Would direct sunlight do that to copper or could it be damaging? Any advice will be appreciated - though not necessarily heeded. Thanks[/QUOTE]</p><p><br /></p>

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