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<p>[QUOTE=&quot;desertgem, post: 698480, member: 15199&quot;]From the mint release, it was that the alcoholic wash that was in use to remove the water-soluble lubricant ( oil needed for the high speed press) was not changed on a regular cycle. Often it became unable to remove the lubricant or became contaminated with it, and this lubricant chemically reacted with the metal of the coin.</p><p>There still seems some debate as to how the lubricant reacted with the metal to become so difficult to remove. Some say it is annealed. I am not convinced. IMO.</p><p><br /></p><p>Some coins and bullion pieces were struck during clean wash periods and would not develop the spots. Others were not as lucky.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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