Unknown Substance On World Coin - Coin Community Forum

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Author	Replies: 5 / Views: 1,305
1000_Rubles Valued Member United States 258 Posts	Posted 07/16/2014 6:37 pm Today I decided to look at my smallest world coins and discovered this 1902 Norway 1 Ore coin had a lot of this green substance on it. There are also many black spots you can't see in this picture. I'm not sure if it is PVC damage or Verdigris, or something else. Can you help me figure out what is it? And what household solutions can I use to remove it? (I don't want to purchase Acetone, Verdi-Gone, or anything else because my budget can't afford it). Thank you! Edited by 1000_Rubles 07/16/2014 6:38 pm Report this Post to the Staff

nalaberong Pillar of the Community Canada 2805 Posts	Posted 07/16/2014 8:46 pm It's verdigris. Sadly, I don't think there are any cheap home remedies for it. Report this Post to the Staff
1000_Rubles Valued Member United States 258 Posts	Posted 07/17/2014 11:07 am Oh that's too bad. Would a vinegar solution do anything for it? Report this Post to the Staff
tkbslc Pillar of the Community United States 1158 Posts	Posted 07/18/2014 12:55 am Yes, but it will also eat the metal finish on the rest of the coin quite rapidly. Boiling hydrogen peroxide is a little less harsh than an strong acid based solution, so I might try that first. In my experience it doesn't discolor coins as badly as vinegar. The bad news is that the coin is never going to be the same again, regardless. Edited by tkbslc 07/18/2014 12:56 am Report this Post to the Staff
Peter THOMAS Pillar of the Community Australia 2830 Posts	Posted 07/18/2014 2:54 pm verdigris, a.k.a. green disease, a.k.a. "coin cancer". the usual treatment is isolation, abandonment, and despair. I have heard of soaking in olive oil, then removing the green bits with a bamboo toothpick, more soaking, etc, will conserve what is left of the coin, and prevent further damage, but the green bits become pitting. Report this Post to the Staff
1000_Rubles Valued Member United States 258 Posts	Posted 07/18/2014 3:37 pm Quote: Yes, but it will also eat the metal finish on the rest of the coin quite rapidly. Boiling hydrogen peroxide is a little less harsh than an strong acid based solution, so I might try that first. In my experience it doesn't discolor coins as badly as vinegar. Well I certainly don't want to damage the coin any further so I won't use vinegar. It's just one little coin so I won't go purchase any hydrogen peroxide, but thank you for the idea! Quote: I have heard of soaking in olive oil, then removing the green bits with a bamboo toothpick, more soaking, etc, will conserve what is left of the coin, and prevent further damage, but the green bits become pitting. I might try that actually! Would anyone else recommend the same treatment? Report this Post to the Staff
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