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<p>[QUOTE=&quot;Leadfoot, post: 999790, member: 2972&quot;]LD, </p><p><br /></p><p>I presume you are not aware that many of the GSA coins were brilliant, undipped, and stored in bags in US government vaults, in some cases for more than 80 years.</p><p><br /></p><p>The point being that if you limit humidity and airflow (and thus sulphur), you essentially limit toning.</p><p><br /></p><p>I suspect (not being a trained chemist or metallurgist), that the coins near the edge of the bags that were toned acted as a type of &quot;sacrificial anode&quot; (sorry for the nautical term) or &quot;corrosion sync&quot; in protecting the untoned coins inside the bag.</p><p><br /></p><p>My understanding is that Intercept Shield&nbsp; products use a similar phenomenon, with a sulphur sync (in the case of Intercept Shield, my understanding is the metal is copper).</p><p><br /></p><p>Perhaps someone more versed in the physics of this can comment....Mike[/QUOTE]</p><p><br /></p>

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