datokobe
Joined: 28-Nov-2015
Posts: 8
Posted: 24-Mar-2019, 15:10
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Posted: 24-Mar-2019, 15:10
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Do you guys know about such phenomenon: there is some kind of creamy matter (look alike) that are coming from bronze coins. is it bad or nothing to worry about?
cro321
Joined: 25-Mar-2016
Posts: 1227
Posted: 24-Mar-2019, 15:49
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Posted: 24-Mar-2019, 15:49
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Is it green? If it's green it's most likely verdigris.
https://en.wikipedia.org/wiki/Verdigris
I collect and deal in ancient Roman coin. In case you're looking for affordable ancient coins or need any help with the coins you already have send me a message.
CobaltBlue
Joined: 16-Mar-2019
Posts: 50
Posted: 24-Mar-2019, 18:36
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Posted: 24-Mar-2019, 18:36
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If it is light brown or tan and completely dry, it is sometimes the local dirt or clay, hardened on after hundreds of years from the location where it was dug up, and never fully removed. I have a few coins on which I never fully removed this clay, because when it is in the field but not on the lettering it serves to highlight the inscription on an otherwise corroded and difficult to read coin.
Cycnos
Joined: 22-Apr-2017
Posts: 3083
Posted: 24-Mar-2019, 21:43
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Posted: 24-Mar-2019, 21:43
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Please provide pictures of your coin : good photos worth thousand of words here
When we are blindness we can only assume what you try to describe.
CobaltBlue
Joined: 16-Mar-2019
Posts: 50
Posted: 25-Mar-2019, 00:05
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Posted: 25-Mar-2019, 00:05
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Actually, it happens that I posted one of them already, just today, as I was looking for a translation. Please see Numismatic Questions, Abbasid Coin Translation UPDATED, immediately above your query. The right photo looks more red from iron, but the top of the left is a tan color. Obviously, the soil type, iron content, and moisture where it was buried effects the color to a significant extent. The material can be hard to remove and tempt you to try scratching the coin, very bad. It is not as if it is loose dirt from a few years of being buried.
Cycnos
Joined: 22-Apr-2017
Posts: 3083
Posted: 25-Mar-2019, 07:43
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Posted: 25-Mar-2019, 07:43
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I just have a look at it and it's as CobaltBlue said : copper coins found in arid regions usually look like that.
We call that a "sand" patina : it's quite common on the islamic and spanish coinages.
Some can been seen in the numista if you browse the islamic states section.
https://en.numista.com/catalogue/pieces149566.html
https://en.numista.com/catalogue/pieces80887.html
https://en.numista.com/catalogue/pieces151365.html
https://en.numista.com/catalogue/pieces82318.html
[...]
It doesn't attack the coin so the best thing to do is to keep it like that, else you'll make it less attractive and can damage the coin.
datokobe
Joined: 28-Nov-2015
Posts: 8
Posted: 25-Mar-2019, 10:56
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Posted: 25-Mar-2019, 10:56
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It is kinda creamy material. Maybe holders or capsules are effecting this condition.
johnspa
Joined: 27-Jun-2013
Posts: 926
Posted: 26-Mar-2019, 21:59
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Posted: 26-Mar-2019, 21:59
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Thats a beautiful coin..
loruca
Joined: 11-Apr-2015
Posts: 1042
Posted: 28-Mar-2019, 05:15
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Posted: 28-Mar-2019, 05:15
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acetone!
I collect anything: If it's Italian or Italian states i collect it even more!
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