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<p>[QUOTE=&quot;fish4uinmd, post: 2272866, member: 74335&quot;]Found this...</p><p>Silver dollars may acquire beautiful toning for any number of reasons. First, if a coin rests against the side of an U.S. Mint bag for many years, the sulfur used as a preservative in the canvas may react with the silver oxide patina on the coin to form bright iridescent toning. The intensity of the colors depends to a large extent upon the humidity of the environment in which the bag was stored, the length of time that the bag remained undisturbed and the exact location of the coin within the bag.[/QUOTE]</p><p><br /></p>

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