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Thread: Unusual toned spot on gold bullion coin

  1. #1

    Default Unusual toned spot on gold bullion coin

    Member of: ANA, CCC, CONECA, Fly-in-club, FUN, NLG & T.E.V.E.C.

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    Possibly another metal. Copper/Silver maybe. Could be that a minute amount of copper alloy near or on the surface of the coin has caused the discoloration.

    Has the look of a small line down the middle though as if something had been lying on it then fell off. ??????????

    I've seen this look on copper coins when a speck of something attaches and a toning begins to spread from that point.

    Unfortunately about the only thing I know about gold coins is that I can't afford them

    Maybe someone that knows will jump in here. See if I'm close about the copper alloy thing

  3. #3


    There was a problem with reddish discoloration due to oil on the planchets. I don't know if this spot of discoloration owes its existance to the same cause.
    Mike Diamond. Error coin writer and researcher.

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    Another possibility in the line of oil, as Mike stated, maybe a thread from a cloth contaminated with oil got onto the coin long enough to cause the discoloration and the pattern that it left.

    Just a thought.

  5. #5


    Hi All - Got to thank you all for your replies. It was a question that came up at the CFCC coin show and I direct the dealer to look at this forum for possible answers and of course you all did provide some good ones.

    BJ Neff
    Member of: ANA, CCC, CONECA, Fly-in-club, FUN, NLG & T.E.V.E.C.

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