arrow3 Comments
  1. Neil
    May 18 - 9:04 am

    Is there any way you could reverse the process by somehow re-introducing potassium ions?

    • Sarah Everts
      May 19 - 5:37 pm

      Good question… I’ve asked the conservators and museum scientists to chime in on it. I would suspect that even if re-introducing potassium ions did bring back the blue color in the glass, it might be hard to get this to happen in the dried paint mixture given its heterogeneousness. Or maybe it would work like a charm…

  2. Laurianne Robinet
    May 20 - 8:36 am

    No, unfortunately it would not be possible to re-introduce potassium in the glass, and that is for 2 reasons.
    First, introduction of potassium in a glass requires an exchange with another ion, usually sodium, and implies placing the glass in a molten potassium salt bath at temperature over 400 degres Celsius for several hours or days.
    The second most important reason is that the silicate glass structure has re-organised itself following the loss potassium creating new bonds leading to a more condensed network. In this new network there is no room anymore for the potassium ion and the bonds created are very strong and cannot be broken easily.

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