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cleaning rinse spots on modern cents

There's a real issue with the mint and leaving rinse spots/residue on modern cents. Is there a safe and effective way to remove them? How do the rinse spots effect grading?

Comments

  • BAJJERFANBAJJERFAN Posts: 31,315 ✭✭✭✭✭
    I would try boiling distilled water in a porcelain pan. You can buy distilled water at most grocery stores. One might also think about adding a scosch of EDTA which can be obtained from eBay or Swanson's Vitamins.

    As usual, practice on common coins first.
    theknowitalltroll;
  • MsMorrisineMsMorrisine Posts: 35,884 ✭✭✭✭✭
    As far as I know, they affect grading as any other spot does.

    Current maintainer of Stone's Master List of Favorite Websites // My BST transactions
  • LindeDadLindeDad Posts: 18,766 ✭✭✭✭✭
    Hits when it comes to eye appeal grades.
  • EDTA is n interesting chemical salt that is for sure.
  • GrumpyEdGrumpyEd Posts: 4,749 ✭✭✭
    I don't think there's an easy way to get rid of them.
    Even ones that seem spot free tend to spot over time.
    Even if you could remove them, it might cause something else to happen in the future like they come back or worse.
    It's probably one of the reasons that modern bus strike cents in 70 almost don't exist since almost all have spots or will at some point.
    Ed
  • WaterSportWaterSport Posts: 6,918 ✭✭✭✭✭
    Not possible and I think this problem was even taken to the Mint by our host with formal discussions a while back.

    WS
    Proud recipient of the coveted PCGS Forum "You Suck" Award Thursday July 19, 2007 11:33 PM and December 30th, 2011 at 8:50 PM.
  • ManorcourtmanManorcourtman Posts: 8,191 ✭✭✭✭✭
    The spots cannot be removed or fixed no matter what anyone says!
  • OnedollarnohollarOnedollarnohollar Posts: 2,035 ✭✭✭✭
    Thank you all for your input. I wasn't sure if the "rinse spots" were just surface spots that simply needed a little more "rinsing" or if there was actually a chemical reaction that caused

    a metallurgic change in those areas that was imbedded and irreversible. I tried soaking a sample in a bath of rubbing alcohol, then peroxide (works on acne) , with a water rinse with no

    change to the spotting problem. It didn't seem to affect the original surfaces but again no change in the spotted areas.

    I won't compromise the coin's original look by doing anything extreme but I was hoping to find something easy and effective to improve the eye appeal for grading purposes.

    Again I appreciate the feedback.

  • MsMorrisineMsMorrisine Posts: 35,884 ✭✭✭✭✭
    Stay away from peroxide in the future.

    It is an oxidizing agent.

    Current maintainer of Stone's Master List of Favorite Websites // My BST transactions
  • ambro51ambro51 Posts: 13,949 ✭✭✭✭✭
    They are altogether gone for the 2014 coins. No more spots

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