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 Replies: 20 / Views: 6,732 |
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Valued Member
200 Posts |
One of my friend gave me this Antoninus Pius sestertius today. (RIC 765) As you can see, the coin is infected.  I do not want to make matters worse. Does anyone have experience with this problem? Idea? Any advice would be really appreciated!   Edited by Baltas
01/21/2017 12:59 pm
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Pillar of the Community
United States
1963 Posts |
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Valued Member
 200 Posts |
Do not think so. :(
"Though NCS conservation benefits many coins, there are certain problems that cannot be remedied, such as corrosion, wear, scratches, and white "milk" spots. NCS does not make repairs and, likewise, cannot undo mechanical alternations."
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Pillar of the Community
United Kingdom
2624 Posts |
I have had fair results (and certainly not made things worse) with using acetone on cotton wool to remove as much as possible then Verdicare to treat the infection.
You can get the acetone anywhere and the Verdicare from wizard coins. Postage is likely expensive if you're outside the US.
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Valued Member
200 Posts |
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Rest in Peace
United States
17900 Posts |
David nailed it. Just make sure the acetone is pure.
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Pillar of the Community
United States
949 Posts |
Your coin has bronze disease, not verdigris. Removing the green chemical salts and sealing the areas will only make matters worse. Here is why: once BD starts it sustains itself within the fabric of the coin. Sealing it from air and moisture does not stop the action which continues beneath the sealant. But the sealant does hinder your ability to treat the coin chemically.
The treatment which will stop the progress of bronze disease involves the use of sodium sesquicarbonate and a specific set of procedures for applying it and removing it. Unfortunately this treatment will also destroy some patina. The treatment is not worse than the disease when the BD is in its later stages and is forming pits. That is what it is doing to your coin.
the green deposits are the result of chemical action between the bronze and HCL
BTW- don't let this coin or the material on it make contact with other bronze coins in your collection. True BD is "contagious."
Edited by lrbguy
01/21/2017 12:51 pm
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Valued Member
200 Posts |
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Pillar of the Community
United States
7066 Posts |
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Valued Member
200 Posts |
Thank you!
Now I go and buy the ingredients. :)
I will post pictures when I will finish the process.
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Moderator
 United States
23731 Posts |
Before you go and buy chemicals you may want to try this. I've done this and it halted the progression of the disease. Place the coin in a 200 degree oven or under a lamp that will heat the coin to remove the moisture trapped in it. Once the coin is heated remove it quickly and place it under and air tight jar so the moisture does seep back into the coin as it cools. Once cooled you can remove what remains on the green deposits. Than you can give the coin a coat of REN wax. Simple but it works.
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Pillar of the Community
United States
4971 Posts |
That's what I used to do, but be careful using wax! I had BD on this coin, treated it with distilled water/baking soda, scrubbed, then baked it (didn't use the air tight jar however). looked good, then applied some wax, here it is a few months later...  As lrbguy said... the BD just kept going under the wax. I treated again with distilled water, baked to dry, then treated with verdi-care, then it look like this...  It still looks like that two years later. I just checked it again. Dont' forget to cheep checking your coin, that stuff tends to come back! |
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Valued Member
200 Posts |
Thank you all of you! I did both process twice! :D Just for sure, but I did not cover with wax. The coin is still in quarantine, but looks ok!   |
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Pillar of the Community
United States
7066 Posts |
Wow! Great job. Does the reverse look this good?
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Moderator
United States
23731 Posts |
I agree you did an excellent job.
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Moderator
United States
34428 Posts |
nice job @baltas!
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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Replies: 20 / Views: 6,732 |
Posted 01/21/2017 12:29 pm
