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<p>[QUOTE=&quot;johnmilton, post: 26406679, member: 101855&quot;]Proof bullion coins are issued to be collectors&#039; items. They might prove to be nothing but bullion if the collector market for them dies, but so far as the mint is concerned, they are collectors&#039; items when the facility issues them. The premium prices that the mint charges from Proof American Silver Eagles proves that. </p><p><br /></p><p>So far as the milk spot issue goes, it must have something to do with the chemicals the mint uses to clean planchets. If the cleaning agent is not properly rinsed a residue remains which apparently damages silver.</p><p><br /></p><p><br /></p><p>Back in the day, the mint seems to have used something else on Proof coins, but it used other agents that toned coins. For example many Mint State 1912-S nickels are toned to one degree or another. The coin is seldom found in its original bright white form unless it’s been dipped or cleaned. The San Francisco Mint must have used something on them that caused that.[/QUOTE]</p><p><br /></p>

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