copper spot A spot or stain commonly seen on gold coinage, indicating an area of copper concentration that has oxidized. Copper spots or stains range from tiny dots to large blotches.
copper spot: the reddish spots of color that occasionally appear on gold coins due to oxidation of the small amount of copper in the alloy.
copper-nickel: an alloy used on United States coins that mixes Copper and Nickel in varying amounts.
Copper Spots
Small red/orange areas of patina that occur on gold coins because of impurities in their alloy.
copper spot
A spot, usually on gold coinage, indicating an area of copper concentration that has oxidized.
copper-nickel ...
However, if inaction can result in the advancement of a copper spot or otherwise adversely affect the long-term preservation of the coin, restorative "cleaning" may be beneficial.
Lustrous yellow gold with a faint copper spot below date I 1907 MS-62 I 1926 MS-63. Lustrous with copper spots I 1927 MS-62. Lustrous.
 See also: Copper, Gold, Grading, Surfaces, Toning
  
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