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<p>[QUOTE=&quot;GDJMSP, post: 697468, member: 112&quot;]No one can tell you with absolute certainty what the cause of milk spots is. But it is generally believed that it is the washing process the mint uses on the planchets.</p><p><br /></p><p>This is because there are many, many examples that come directly from the mint in the first days they are available - and they have the milk spots. </p><p><br /></p><p>Then there are those that do not have any milk spots visible, they are sent in slabbed and graded, or just stored in a good quality holder at home. And then suddenly the milk spots appear as if from nowhere.</p><p><br /></p><p>Now, the reason it is believed that they are a result of a mint process is because the spots do not come off. Even by using the strongest chemical coin dip we have - the spots do not come off. </p><p><br /></p><p>This same chemical coin dip will remove any and all toning in a second or two because it literally eats away a thin layer of the metal from the coins. But because the spots do not come off with the dip, that means that the spots are deep into the metal of the coin. And the only way that can happen is if it happens at the mint. So it is definitely not a storage issue.[/QUOTE]</p><p><br /></p>

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