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Author Topic: Naumann’s patina  (Read 454 times)

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Offline Nikko

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Naumann’s patina
« on: January 18, 2022, 04:07:40 PM »
I think we all have a big issue with the so called Naumann patinas.
I won the coin attached in a recent auction (august 2021); a pleasant coin with dark patina and some silvering but….
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Offline Nikko

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Re: Naumann’s patina
« Reply #1 on: January 18, 2022, 04:09:51 PM »
…this is the coin now, after a brief soaking in distilled water and a few hits with tooth brush.
I think I will no more join their auctions.
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Online Victor

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Re: Naumann’s patina
« Reply #2 on: January 18, 2022, 07:21:03 PM »
definitely something strange going on. I have all my NN coins in the same tray so that I can keep an eye on them.

I'd like to say I will not buy from them again, but they list so many coins that interest me. it's like gambling...I hope these don't turn green.  :P
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Offline marandnumiz

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Re: Naumann’s patina
« Reply #3 on: February 01, 2022, 03:26:33 PM »
The coin is amazing in any case. I like fully cleaned version the most, it now looks almost as struck (minus silvering).

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Offline six2ten

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Re: Naumann’s patina
« Reply #4 on: February 05, 2022, 04:21:10 AM »
Sigh …. Another one. But not sure it’s bronze disease. It didn’t brush off at all, and only came away once treated wit a sodium carbonate / bicarbonate mix

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