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 Replies: 19 / Views: 2,677 |
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Pillar of the Community
Lebanon
505 Posts |
Hello , How I can remove this residue on this medal due to this foam paper The medal was left for years, the paper was on the medal in the box   Edited by chronos
10/17/2020 09:31 am
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Pillar of the Community
Canada
9158 Posts |
You will need to find 100% acetone, usually from a hardware store.
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Pillar of the Community
1110 Posts |
Hmmmm, that stuff might be baked into the surface. "Maybe" a little acetone. "WAIT" for other to reply with feedback.
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Bedrock of the Community
United States
94367 Posts |
Agree, that green color is worrisome.
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Pillar of the Community
 United States
5667 Posts |
That looks more like verdigris than PVC damage, in which case acetone won't help. It certainly doesn't hurt to try that first, but I suspect it won't do anything.
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Pillar of the Community
 Lebanon
505 Posts |
It is a surface from the paper itself that sticked on it ,Is it safe to use acetone on bronze ? Because it is a bronze medal.
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Pillar of the Community
United States
5825 Posts |
Quote:
That looks more like verdigris than PVC damage, in which case acetone won't help. It certainly doesn't hurt to try that first, but I suspect it won't do anything. Start one step at a time with what would do the least harm to the medal if it were the wrong treatment. 1. Acetone 2. Soap, distilled water and VERY gentle manipulation with a Q-Tip. 3. Wait for further suggestions. |
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Pillar of the Community
United States
572 Posts |
The only thing I'd add to the discussion is that the proper order of solvents to try in order of polarity is:
1. Distilled water
2. Acetone
3. Xylene
All three are safe for use with bronze, but sadly if the reaction is PVC related, which appears likely, none of these will effectively remove it. Verdi Care is a product that has some effectiveness against PVC residue but is sometimes difficult to find.
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Bedrock of the Community
United States
10034 Posts |
Although I have no personal experience with it, I have read on this forum that copper coins could pick up a slight pink tint when acetone is used IN DIRECT SUNLIGHT. Otherwise acetone is safe. I understand bronze is an alloy, but just thought I would mention this.
Personally I would try the hot soapy water, then acetone, then xylene.
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Pillar of the Community
1110 Posts |
Quote:
It is a surface from the paper itself that sticked on it This isn't paper.  |
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Bedrock of the Community
United States
94367 Posts |
What shows on the medal's surface looks much different than the color of the cloth. I fear that moisture accumulated between the surfaces, creating a corrosive chemical reaction with the copper.
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Bedrock of the Community
United States
20753 Posts |
Not sure what is available over there but if you can find Acetone, try that first. However, there is a good chance the damage is done to the metal so in that case not much can help. Quote:
Although I have no personal experience with it, I have read on this forum that copper coins could pick up a slight pink tint when acetone is used IN DIRECT SUNLIGHT. Otherwise acetone is safe. I understand bronze is an alloy, but just thought I would mention this.
Personally I would try the hot soapy water, then acetone, then xylene. for one thing, never, ever use soapy water. With out knowing what that water really is you could end up with even more damage. And that old wives tale of how Acetone effects Copper. I read that same silly stuff a long time ago. I put Copper coins in a jar filled with Acetone and put it in direct Sunlight for a few weeks. Nothing happened. Maybe I was using the wrong Sun.  |
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Pillar of the Community
Lebanon
505 Posts |
@coinfrog I think you are right ,because the cloth was on the medal found with rot on its box.
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Bedrock of the Community
United States
17884 Posts |
The one thing that worries me is the medal appears to have a surface treatment such as a lacquer or other coating that may react with the acetone.
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Pillar of the Community
Lebanon
505 Posts |
Edited by chronos
10/20/2020 05:29 am
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Bedrock of the Community
Australia
21786 Posts |
It seems to me that the soft sponge cloth that has been in contact with the medal, and was enclosed with the coin in the box, may have had some moisture in it.
Some of that green tinge looks like minor verdigris damage.
I can only agree with some of the suggestions so far, that have been put forward:
1. gentle rubbing with a Q-tip dipped in acetone,
2. gentle rubbing with a Q-tip soaked in distilled water, then dry thoroughly.
If it is verdigris, neither of the above treatments will help much.
If it is verdigris, it may be worth doing a Google search on how museums conserve and protect copper and bronze objects that have been affected by verdigris attack. there will be risks in whatever procedure you may adopt.
Potential risks involving verdigris passivation may deter you from adopting any of the suggested museum procedures.
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Replies: 19 / Views: 2,677 |
Posted 10/17/2020 09:33 am
