Exonumia: French plaque with verdigris

Discussion in 'World Coins' started by GeorgeM, Jan 15, 2021.

  1. GeorgeM

    GeorgeM Well-Known Member

    This medal/plaque recently came into my possession. The seller's photos very much downplayed the verdigris spots that blemish the obverse, and I'm wondering if there's anything that can be done to neutralize them and/or eliminate their spread?

    Also, I was unsure what forum to post this into. Do we have an exonumia forum that I'm just not seeing?

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    Last edited: Jan 15, 2021
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  3. fretboard

    fretboard Defender of Old Coinage!

    Nice, but is that bronze disease or verdigris??! I would drop it into hydrogen peroxide but no longer than 4 hours. Some will say distilled water but I doubt distilled water would work. The thing about using hydrogen peroxide is it will definitely change the color of the metal if you leave it soak for longer than 24-48 hours! Acetone? I don't think it will work but heck I've been wrong plenty of times on this forum! :D
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  4. GeorgeM

    GeorgeM Well-Known Member

    Thanks. I was thinking about acetone. But I'm not sure how it reacts to copper or bronze. Anyone have experience?
  5. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    Ouch! You might try soaking it in 100% virgin olive oil and use a Q-Tip to remove the debris. A lengthy soak shouldn't hurt the plaquette. It might take more than one soak.

    I'll have to admit that this medalist has the longest name I have ever come across.
    Jules Prosper Joseph Marie Edmond Legastelois He was born in Paris in 1855, and most notably, was a pupil of Louis Oscar Roty.
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  6. mrbadexample

    mrbadexample Well-Known Member

    I think you'd be wasting your time. Acetone won't hurt it but it won't touch that verdigris either. :(
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  7. GeorgeM

    GeorgeM Well-Known Member

    A day of soaking in extra virgin olive oil and brushing clean with a q-tip seems to have taken the worst of it off, but has keft areas of darkness.

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