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<p>[QUOTE="Carausius, post: 4893936, member: 76440"]It was the canvas bags that did it in some cases. When I was a kid collecting US coins in the 1970s, the US government released a hoard of Carson City mint Morgan Dollars that had been sitting in mint bags in the US Treasury for nearly 100 years. The coins were slabbed and sold as collectors items. As I recall, the dollars that had been on the outside of the hoard, resting against the canvas bag material, exhibited stunning, rainbow toning on the bag side only. Often, there would be an "eclipse" effect to the toning, where another coin was present, and the rainbow effect would be crescent shaped. These toned dollars appealed to many collector. Others preferred the untoned examples. I always liked the toned coins.</p><p><br /></p><p>US silver coins stored in manilla envelopes also develop rainbow toning over time because of the sulfur in the paper. It is possible to get similar toning to the above dollars after many years of envelope storage.[/QUOTE]</p><p><br /></p>
[QUOTE="Carausius, post: 4893936, member: 76440"]It was the canvas bags that did it in some cases. When I was a kid collecting US coins in the 1970s, the US government released a hoard of Carson City mint Morgan Dollars that had been sitting in mint bags in the US Treasury for nearly 100 years. The coins were slabbed and sold as collectors items. As I recall, the dollars that had been on the outside of the hoard, resting against the canvas bag material, exhibited stunning, rainbow toning on the bag side only. Often, there would be an "eclipse" effect to the toning, where another coin was present, and the rainbow effect would be crescent shaped. These toned dollars appealed to many collector. Others preferred the untoned examples. I always liked the toned coins. US silver coins stored in manilla envelopes also develop rainbow toning over time because of the sulfur in the paper. It is possible to get similar toning to the above dollars after many years of envelope storage.[/QUOTE]
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Toning examples... how, why....what?
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