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 Replies: 10 / Views: 3,042 |
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New Member
United States
22 Posts |
Can you tell a novice what the green areas are on the front and around the back edge of this coin in the cracks? Is this normal corrosion or patina or gunk or damage or .... ? Thanks Much! Blake   |
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Valued Member
United States
408 Posts |
Could be PVC damage or just some gook that you can get off with some acetone.
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Pillar of the Community
United States
7066 Posts |
It's possibly verdigris, a hard green deposit which, while normally occurring on bronze coins, is known to show up on debased silver coins too.
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Moderator
 United States
23731 Posts |
It appears to be verdigris, this coin type was not made from high grade silver.
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Moderator
United States
34397 Posts |
Ron/Bob, if it is verdigris, it is better to leave it alone then, right?
"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
7066 Posts |
In my opinion, yes, Dave. I would leave it alone. While some folks have had impressive results removing verdigris, I don't know their secret. Verdi-care alone doesn't do it. But anyway, for me, unless we were dealing with active bronze disease, I'd leave things as is.
Btw, wertsdb, really nice coin!
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Pillar of the Community
Canada
1192 Posts |
I have had decent luck removing such encrustations off silver coins with a bath in diluted lemon juice.
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Pillar of the Community
 Spain
2752 Posts |
I actually think it adds something to the coin... Considering the Indo-Sasanian billon Drachms were minted around 900AD...In my opinion it should show some kind of ageing. And your coin looks really nice as is.  Love those stylized designs. Paul |
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Moderator
United States
23731 Posts |
It's not going to hurt the coin and in this case it enhances the detail of the face.
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Pillar of the Community
United Kingdom
2624 Posts |
I am not saying you guys are wrong to be worried by green on coins...whether its PVC slime or verdigris its not what you want. Having said that there are other perfectly innert mineral deposits that are hard to remove but do no real harm and it depends what the coin was buried in.
For instance the coins of Elimais always seem to have blue/green deposits since the area they are usually buried in is like that.
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New Member
 United States
22 Posts |
Thank you all for the comments and suggestions. And for the kind words about the coin itself! This is my first "Indo-Sassanian" billon example and am in love with them at the moment....
So for how I'll leave the "green highlights" as is. And if I notice that it is "growing" in any way I'll come back for some more suggestions on how to save the coin.
Much appreciated!
Blake
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Replies: 10 / Views: 3,042 |
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Posted 12/16/2016 9:40 pm
