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Message:: [QUOTE="GDJMSP, post: 2887114, member: 112"]There is and for a lot of years has been a lot of speculation about what causes milk spots, but as of yet nobody knows. As for how they wash the planchets being what causes it, I think it unlikely. I say that because if it was then you should be able to safely remove the milk spots for they would have to be on the surface of the coin - not in the surface of the coin. And I'm saying they are "in" the surface of the coin, meaning within the metal itself, because no one has found a way to safely remove them. And anything that is on the surface can be safely removed. And rather obviously if it's not on the surface then the only thing we are left with is that whatever it is that causes milk spots has to be within the metal itself.[/QUOTE]