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<p>[QUOTE=&quot;coolstuff1776, post: 257680, member: 9682&quot;]<b>Preserving</b></p><p><br /></p><p>If you wanted to &quot;preserve a coin&quot; it would be encased upon manufacture and prevented from comming into contact with damagaing chemicals, like the damaging chemicals in the air.</p><p>&nbsp;</p><p>If an uncirculated morgan dollar has tarnished, or as some like to call it, toned, it is essential to the preservation to remove the layer which was not present at manufacture.&nbsp; Also this layer of tarnish contains harmful chemicals which react with the silver to its long term detriment.</p><p>&nbsp;</p><p>If you properly remove the offending and damaging layer of oxidation and then encase the coin in a container, such a a sonicly sealed slab, or other such container which virtually eliminates further oxidation to the coin, you are most certainly helping to preserve the coin for many many generations.</p><p>&nbsp;</p><p>These generations will be able to see and enjoy what the coin looked like the day it was made.</p><p>&nbsp;</p><p>If all the coins were allowed to tarnish and keep oxidizing, all that would be left in 200 years are some big black circles of metal which bear no resemblence to its original state.</p><p>&nbsp;</p><p>Oxidation on silver ends in BLACK, not a speculation but a chemical fact.</p><p>&nbsp;</p><p>If you have a beautiful rainbow toned coin, and want to save it for future generations to appreciate, unless it is sealed off from all oxygen, it will loose that beautiful rainbow over time.</p><p>&nbsp;</p><p>And as far as how many dips to get from black to blast white, ONE, in a thouria (ez-est) dip, about 45 seconds with agitation.[/QUOTE]</p><p><br /></p>

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