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Is It Possible To Stop Verdigris/Bronze Rot

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Alex12780's Avatar
United States
344 Posts
 Posted 04/29/2017  11:32 pm Show Profile   Bookmark this topic Add Alex12780 to your friends list Get a Link to this Message Number of Subscribers
I have an ancient coin with a healthy amount of corrosion and green pits. I managed to scrub a good bit of it off with a toothbrush and a thumbtack(being very careful). However there are areas that seem to be stained making the green not able to come off. I stopped the scrubbing altogether when I noticed the shiny metal below barely starting to appear. I left it soak for a while in distilled water and a little bit in olive oil. But the green just won't go away. I don't know much about ancient coins but I figure if I take it out of the distilled water tomorrow and put it in the oven at a very low temp below 250) then I would be sure moisture is completely off of the coin and I can store it in a 2x2 sealed with staples and tape. Will the coin continue to corrode?
Edited by Alex12780
04/29/2017 11:33 pm
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louisvillekyshop's Avatar
United States
1306 Posts
 Posted 04/29/2017  11:49 pm  Show Profile   Bookmark this reply Add louisvillekyshop to your friends list Get a Link to this Reply
Well depends on how much you care about the coin I suppose. I hold a doctorate in chemistry and anything can be reversed. Hard to get the students to understand nothing is ever lost we can always react it back. Fish chemicals can be fun to try if you are interested. Product called api stresscoat but only a little bit in a few hundred ml and I warn you it will turn the coin black if you forget about it. But you can knock out that green chloride. Then when you get what you want done you probably should seal the area with wax a bit as it is prone to react again. Then of course move to Arizona and stay off the islands off Florida with your coins. But honestly, if you do this you don't just change the area with the issue, you change the patina of the whole coin darker. But if the coin is about to be lost you can stabilize it potentially but it will look quite different. Even if you use a q-tip and only apply to the affected area that area won't go back to looking like the rest of the healthy part of the coin with the regular patina. But it can stabilize and you can put a bit a wax as I said. I did do some experiments a few years ago. Greater good is the equation you start to apply when a coin is in deep trouble. No promises of course.
Edited by louisvillekyshop
04/30/2017 12:49 am
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Alex12780's Avatar
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344 Posts
 Posted 04/30/2017  12:48 am  Show Profile   Bookmark this reply Add Alex12780 to your friends list Get a Link to this Reply

Quote:
stay off the islands off Florida with your coins.


Constantius Gallus will be disappointed to hear he's no longer going...

The coin itself isn't anything of considerable value, it's just a common roman I found in a junk bin for 25˘. I managed to remove most of the spots with more picking and scrubbing but I figure I'd rather use the money I could spend on products on more ancients, (preferably without any issues).

Here's before and after pictures from when I got it to now
Is-It-Possible-To-Stop-Verdigris/Bronze-Rot

Is-It-Possible-To-Stop-Verdigris/Bronze-Rot



Is-It-Possible-To-Stop-Verdigris/Bronze-Rot

Is-It-Possible-To-Stop-Verdigris/Bronze-Rot
Edited by Alex12780
04/30/2017 12:50 am
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echizento's Avatar
United States
23731 Posts
 Posted 04/30/2017  01:08 am  Show Profile   Bookmark this reply Add echizento to your friends list Get a Link to this Reply
I've always had luck using olive oil it will soften the material to where the crusty deposits can be removed. The only draw back is that it has a tendency to darken the coin.
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sel_69l's Avatar
Australia
21788 Posts
 Posted 04/30/2017  08:54 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
With good chemistry it may be possible to stop further verdigris corrosion, but pit damage corrosion pits cannot be removed in the restoration of the coin.
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