Bronze/Copper degradation in slabbed coins

Discussion in 'Ancient Coins' started by Clay Bowen, Jun 21, 2018.

  1. Clay Bowen

    Clay Bowen HaveYouSeenTheWizard?

    I have some NGC certified ancients which are bronze or copper, which are gaining a lot of green oxidation. They had none of this (well, the Bosporus had one tiny green dot) when I got them. Not sure how to handle as these are all slabbed and "sealed"

    These are all in very fine condition (MS, Ch AU) and I'd hate for them to get destroyed.

    Any suggestions?

    Bosporus-AE20-4thCentBC-front.JPG
    Bosporus-AE20-4thCentBC-back.JPG
    Rome-AE3-Constantine-1st-front.JPG
    Rome-AE3-Constantine-1st-back.JPG

    Thanks
     
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  3. TIF

    TIF Always learning.

    Another reason to stay away from sealed slabs!

    Break them out and treat the corrosion. Do not re-slab. Store them with desiccant.

    Here's one of many threads about bronze disease and how to treat it:

    https://www.cointalk.com/threads/bd-victim-naw-bd-survivor-for-now.310550/

    There are also many threads about techniques for removing coins from their TPG holders. Easy peasy and oh so satisfying :D
     
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