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 Replies: 9 / Views: 879 |
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New Member
Argentina
33 Posts |
Hi everybody! I am RickyO from Argentina. I found a beautiful, and interesting coin that exhibits some nasty greenish thingies:   The questions are... Is it PVC damage, or what is it? Can it be safely refomed without utterly destroying the coin in the intent? I bet a knife grinder can also remove it. Or perhaps sodium bicarbonate and hot water could be a better choice? Or... tell me the sad truth... nothing can remove the damage already done and the green invader is there to stay forever on the coin? I am prepared for the truth. I can handle it. |
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Bedrock of the Community
United States
74444 Posts |
It sure does look like it. Have you tried using 100% pure Acetone and Verdi-Care yet?
Errers and Varietys.
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New Member
 Argentina
33 Posts |
Unfortunately acetone is a prohibited substance in my country. Would alcohol suffice?
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Bedrock of the Community
United States
74444 Posts |
Errers and Varietys.
Edited by Errers and Varietys
08/06/2023 12:25 am
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New Member
Argentina
33 Posts |
Ah, OK. I think I understand. Alcohol isn't as strong and effective as acetone, but it might help and it won't cause any further damage anyway. Thank you, I will try it!
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Moderator
 Australia
16836 Posts |
If acetone (or ethanol) does nothing to it, then it most likely isn't PVC goo. However, it most likely is; these coins are 900 fine silver, and should not otherwise turn green.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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New Member
Argentina
33 Posts |
The green monster on my coin feels weird and I even think it might be some sort of green paint. Will experiment and post the results: alcohol, see if I can find ethanol, hot water and sodium bicarbonate and a knife grinder as a last measure.
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Pillar of the Community
United States
2235 Posts |
PVC damage can range from a thin film covering to green encrusted spots. Left untreated it can eat into the coin creating pits. If it's not PVC damage it could be natural environmental oxidation from the copper in the coin. The green spots look hard, not powdery like verdigris (bronze disease). It may not come off. Copper green spots can develop especially if coins have been in the ground or exposed to high humidity. Trying to remove green spots may cause damage but you could try. Some suggest soaking in vinegar to remove green spots but I don't know if this works or if it would cause damage. I have an ancient Roman silver denarius with a green spot on it.
Edited by livingwater
08/06/2023 1:00 pm
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Pillar of the Community
United States
1962 Posts |
"Acetone is a prohibited substance in my country."
Argentine women just leave their nails painted forever...
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Pillar of the Community
United States
878 Posts |
Good luck! Let us know how it goes!
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Replies: 9 / Views: 879 |
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Posted 08/06/2023 12:01 am
