Lint in a proof coin

Discussion in 'Error Coins' started by MatrixMP-9, Nov 20, 2019.

  1. MatrixMP-9

    MatrixMP-9 Supporter! Supporter

    Do any of you guys have a coin that shows an example of what "lint" from the polishing rag looks like on a proof coin? I read an article about it but I cant find a single image example. Im super curious. The indentation from "lint" on the die would be an "error" correct???

    Wouldnt it just look like a scratch???
     
    Last edited: Nov 20, 2019
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  3. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    They don't use rags to polish the dies for proof coins. Read the link below.

    http://www.coinnews.net/2013/10/04/how-the-philadelphia-mint-polishes-dies-to-make-proof-coins/

    Chris
     
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  4. MatrixMP-9

    MatrixMP-9 Supporter! Supporter

    Thanks Chris! I hate that I cant trust anything I read. I'd post the article but its pointless. thank you for the clarification. Maybe thats why I couldnt find an examples to look at online!
     
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  5. paddyman98

    paddyman98 Let me burst your bubble! Supporter

    From my collection.. They don't mention what caused it but it is obvious.
    $_57.jpg $_57b.jpg
     
  6. Conder101

    Conder101 Numismatist

    To polish them no they don't, but they do use them to wipe the surface occasionally during striking. There was a video a little while back on youtube that showed the coining of I believe proof silver eagles. It showed about a half dozen cycles then they stopped the press and the operator rached in with a rag and wiped the faces of the dies, then they resumed striking.
     
    Last edited: Nov 21, 2019
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  7. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    The use of rags to clean certain areas of the dies and equipment can be likened to using rags to clean a bathroom. But, that has nothing to do with the process of making the dies in preparation for producing proof coins.

    "Now, it’s just a matter of using three varying grades of paste-like diamond dust and rotary tools to achieve the mirror-like affect.

    [​IMG]
    Three different grits of diamond dust are used in polishing dies.

    [​IMG]
    Alberto applying diamond dust compound to a proof die.

    A grade of the diamond dust is added to the die by hand, and the polishing begins through the abrasive contact of the compound and rotary tip."

    Chris
     
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