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 Replies: 9 / Views: 1,388 |
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Pillar of the Community
Russian Federation
1557 Posts |
A Uruguayan coin covered with bubbles and with a terrible green coating appeared in my collection. What tips do you have on cleaning such a coin.   |
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Pillar of the Community
United States
7613 Posts |
A product called Verdi-Care might be a good start. There are plenty of topics here on CCF that reference the product, use and outcome. You may be able to find the product on ebay. |
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Pillar of the Community
Australia
599 Posts |
Green stuff can often be fixed.
But if its erupting from the surface that's not good.
Watch your top knot
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Pillar of the Community
 Australia
2500 Posts |
First off I would give the coin a long soak in 100% acetone in a screw top glass jar, overnight at least. Remove it from the jar and place it flat on a microfibre cloth. Dip a Q-tip (cotton bud) in acetone, lay it flat on the surface of the coin and using your fingers to twirl it, roll the Q-tip over the surface of the coin without dragging it across. Roll back and forward, continually re-dipping in acetone. This may or may not remove some of the green/blue color. This may be verdigris or PVC attack ( the chemists here will elaborate on that). If you can get some Verdi-Care it could be used to good effect, providing the coin is not at the point of corrosion. If it is corroded, then IMO, all hope is lost. I purchased some Verdi-care online, delivered to Australia from Wizard Coin Supplies, they show some in stock at the moment, but I don't know if they can export to Russia. If you can get it, and the coin is suitable, after the coin has been washed with acetone, lay the coin flat on a microfibre cloth and place a drop or two on the surface and use a toothpick or similar to work the drop over the coin surface. Let it soak in overnight at least. Then dampen a spot on a microfibre cloth with more drops of Verdi-care and gently rotate the coin on the cloth. Anyway, perhaps I dribble on a bit here. There are a number of topics on CCF about using the product. Good luck.
Edit: Oh yeah, nearly forgot. Use great care with acetone, highly flammable.
The Ox moves slowly, but the Earth is patient.
Edited by ttkoo
01/06/2023 02:55 am
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Moderator
United States
56855 Posts |
Unless you really know what you are doing do not use a q-tip. John1  |
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Moderator
Australia
16806 Posts |
That's proper corrosion on that coin, not PVC damage. Acetone won't do anything it.
I think any kind of treatment done to this coin is going to leave a cratered mess on the obverse.
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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Bedrock of the Community
United States
94367 Posts |
Good advice from all, but that coin is a goner.
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Pillar of the Community
 United States
5661 Posts |
Agree, not salvageable, too much corrosion.
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Bedrock of the Community
United States
19113 Posts |
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Pillar of the Community
 Russian Federation
1557 Posts |
I took a cleaning agent to clean all kinds of metal for coins that I had in stock. I managed to partially remove the greenery that hadn't sunk too deep yet, but I noticed that I had erased some of the metal (this can be seen by the brighter edge)  |
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Replies: 9 / Views: 1,388 |
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Posted 01/06/2023 01:20 am
