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<p>[QUOTE=&quot;Lehigh96, post: 2703850, member: 15309&quot;]The answer to that is exceedingly simple, and something that a collector of your experience should already know.&nbsp; Morgan Dollars were produced by the millions which created an unnecessary surplus of coins for the over produced common date years.&nbsp; These coins were placed in $1K sulfur laden canvas bags and stored in old bank vaults for decades without the benefit of climate control.&nbsp; As a result, the coins near the canvas surface often yielded fantastically rainbow bag toning.&nbsp; And for as many as are still available today, many multiples of those were sent to dipping factories to make them shiny and new again when toning was frowned upon once upon a time.</p><p><br /></p><p>As for the other series you mention.&nbsp; They don&#039;t exhibit dramatic bag toning because they were not subjected to the same storage conditions that Morgan Dollars were.&nbsp; That said, I have seen toned examples of every 19th century series you mentioned. The large majority of those exhibit secondary toning after being dipped and placed in a coin album with sulfur rich paper.</p><p><br /></p><p>Your contention that rainbow toning is not a natural process has been debunked many many times.&nbsp; The science is well known, and has been posted on this very forum.&nbsp; Have you never read Jason Poe&#039;s post on the subject?&nbsp; </p><p><br /></p><p><a href="https://www.cointalk.com/threads/what-you-need-to-know-about-the-science-of-toning.84670/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/what-you-need-to-know-about-the-science-of-toning.84670/">https://www.cointalk.com/threads/what-you-need-to-know-about-the-science-of-toning.84670/</a></p><p><br /></p><p>I just resurrected it for you and anyone else who wants to learn about toning.[/QUOTE]</p><p><br /></p>

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