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What is commonly referred to as "milk spots" on mid-century proof coins or Peace Dollars are usually not able to be conserved away. The problem is that these spots were created during the manufacture of the coin at the planchet stage. The substance causing these spots has been struck into the coin. Removing these spots would then cause irreversible damage to the surfaces of the coin.


There are some spots, however, commonly called milk spots which removable through professional conservation. These kind of spots are made up of a mix of surface residues and toning.


Chris, NCS

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