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What slabs: brand and generation cause toning and damage coins ?

IKUIKU Posts: 65 ✭✭✭
edited June 2, 2022 1:57AM in Q & A Forum

About coin holders what manufacturers and generations cause toning and such damage to coin ?

  • Does white Anacs Gen.6: 7-digit holder mfg.1999-2006 cause toning ?
  • Where some plastic inserts made of PVC or why they damage coins ?


  • Namvet69Namvet69 Posts: 8,398 ✭✭✭✭✭

    As previously discussed here, early holders of the major tpgs were generally not sealed as well as subsequent generations. Electrostatic fusing of the plastic seam is pretty good now. I don't know what testing has been done to prove a level of hermetically sealed proof. Others probably know more. Peace Roy

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  • IKUIKU Posts: 65 ✭✭✭

    Ok. Did holders contain questionable chemicals or plastic mixes that effect coins ?

    • Some say "chemicals used during plastic molding process" might be present inside holders and they cause toning.
    • Some say inks: black and color used in lettering and barcode cause toning.
  • PapiNEPapiNE Posts: 250 ✭✭✭

    The effects of PVC, a known coin killer, was known before slabbing commenced o/a 1986 so it was not used in the production of holders. Slabs are not hermetically sealed and coins can be effected by air; particularly temperature and humidity. Anything else that is in the air could also effect them (use your imagination on this one) over longer periods of time. In short, toning is caused by the environments interaction with the surface of the coin. How much effort went into ensuring the holder or label don't negatively effect the coin MIGHT be found through research. I have not seen it discussed here. Your "some say" are opinions. Use Google to find information or become/hire a chemist. Here's one article I found:


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