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 Replies: 14 / Views: 4,894 |
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Pillar of the Community
United States
1120 Posts |
Caligula & Divus Augustus Æ Dupondius. 37-41 AD. CONSENSV SENAT ET EQ ORDIN P Q R, laureate & togate statue of Gaius Caligula seated left on curule chair, holding branch / DIVVS AVGVSTVS S-C, radiate head of Divus Augustus left. This was one of my first coins and I actually bought it like this about three years ago. I thought it was Verdigris so I left it alone. Here is the original pic:  Here's the coin now.     Will soaking in distilled water take away the green or stop the disease if it's there? P.S. The Green doesn't bother me. |
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Moderator
 United States
23731 Posts |
From the pictures the green spots look like active bronze disease and should be treated. I posted this earlier today on another thread, but encase you didn't see it: http://www.classicalcoins.com/bronze_disease.htmlLooks like someone did some harsh cleaning on it also. |
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Pillar of the Community
 United States
1120 Posts |
Yeah I saw the link that's why I posted. I'm gonna start the treatment with distilled water soaks.
Should the disease have spread more over 3 years or does it take a long time to totally ruin the coin?
Edited by travelcoin
02/27/2018 8:43 pm
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Moderator
United States
34393 Posts |
Quote:
The chlorides causing bronze disease pervaded the specimen over hundreds or thousands of years From Ron's link... Also, one other thing is that you need to quarantine this coin so that it doesn't spread BD to your other coins. "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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Pillar of the Community
United States
1120 Posts |
Darn, I had with the other coins in my collection. I think they are ok though. I read the page and if it's not in direct contact with other coins, you should be ok. It was stored in it's own space in a velvet tray.
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Moderator
United States
34393 Posts |
Ok good, you are probably ok with your other coins. I might not put another copper-alloy coin in that space in the tray though. Better buy something silver or gold to fill the space.  "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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Pillar of the Community
United States
1120 Posts |
Quick Update: I just tried to pick at it with a toothpick and brushed it with a toothbrush also. It is NOT powdery at all and it didn't make a difference the green is still there.
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Pillar of the Community
United States
3433 Posts |
Drastic conditions call for drastic measures
Drop the coin into full strength ammonia for 15 minutes.
Do not touch or rub the coin while immersed
Wash away the ammonia and leave on a paper towel to dry. If the green is gone treat with an oil based coin preservative.
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Pillar of the Community
United States
1120 Posts |
Well this is the result.   I researched the forum and found a link provided by Bob: http://kevinscoins.ancients.info/BD...Disease.html and followed those directions. After, for good measure, I took the advice of echizento from a previous post: Quote:
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. FVRIVS I bought some Ammonia for back up! Didn't drown him in it yet  The process darkened the coin and I personally like the color. So much so, I added an over cleaned coin to the solution and it darkened it just nice. I don't have any Ren wax so I'm leaving it as is - quarantined and on surveillance. Edited by travelcoin
04/10/2018 9:40 pm
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Moderator
United States
34393 Posts |
So nice to have your follow-up on this thread @TC. Nice work!
"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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Pillar of the Community
United States
3433 Posts |
There is a small spot on reverse that looks to be infected. BD must be eliminated completely or it will reoccur.
Keep a close watch over it
You may want to do a gentle scrape on this spot
The scarring is rather severe already so a small scrape mark will not be the worst thing you could do
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Bedrock of the Community
Australia
21786 Posts |
Locally re treat this area only.
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Pillar of the Community
United States
1120 Posts |
Thanks guys, I picked at that spot, but it's as hard as a rock.
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Bedrock of the Community
Australia
21786 Posts |
Saw on another forum, not anything to do with coins.
Try a small drop of WD40on the spot and allow to soak; it may soften the hard verdigris, making it easier to remove.
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Pillar of the Community
United States
1120 Posts |
Follow Up: A couple of years later and the coin seems to be holding steady. I have it encapsulated, which could be helping. So everyone who has a BD issue, this thread is proven reliable. Nice job everyone. 
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Replies: 14 / Views: 4,894 |
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Posted 02/27/2018 8:35 pm
