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 Replies: 20 / Views: 3,191 |
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CCF Advertiser
 United States
1306 Posts |
Having a small speck of green, which is only a color you get from a copper compound, does not at all hurt the integrity of the coin as ancient ores were not pure enough to produce a 100% silver that will not have other metals as trace impurities. So if the coin was perfect for silver content you would have a problem. Either way, as most of the coin is a fine silver it is not like the green area will grow as it is based on the copper impurity natural to the composition from the ancient mint. I think collectors understand this when they see the coin in my opinion.
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New Member
 14 Posts |
Thanks ! Ah, is it necessary to clean it with acetone? What is your opinion ? As a precaution?
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Pillar of the Community
United States
564 Posts |
That's a pretty coin. A speck won't hurt your coin niki just leave it alone. Hope you stay around.
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New Member
14 Posts |
However, is there a way to know, if the blue green point is from a PVC fault or is it something else? How do I know for sure, if PVC is a surface damage? What are the definite signs for that?Thank you !
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Moderator
United States
34430 Posts |
There are multiple non-destructive chemical analyses that could be performed if you have access to specialized laboratory equipment. For example, with a scanning electron microscope (SEM) and energy dispersive spectroscopy, you could look at the elements in the green blob and potentially determine the constituent elements. For finding carbon, you would more likely need a different piece of equipment on the SEM (wavelength dispersive spectroscopy).
Have you considered simply giving this coin an acetone bath?
"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
3444 Posts |
I believe if it were caused by contact with the plastic flip it would be restricted to the highest points on the relief (ie the hairline and ear) and not the fields.
Personally I prefer the few silver coins I own to have some toning to them.
A few years back I showed an Alexander tetradrachm I had packed away years ago in a jewelry box. In the larger spaces of the box I had wrapped some pieces of Roman glassware in old newsprint. After several years in storage the silver tetradrachm had acquired a fabulous toning !
No longer did I need to wear sunglasses to admire it.
If I owned this coin I would probably do it again !
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New Member
14 Posts |
To my regret, I have no access to such equipment. I have not decided yet to wash the coin in acetone! I just want to keep it in the right way in the future.I find ,it difficult to decide what is right to do in this case. :)
Edited by niki64
12/31/2017 11:46 am
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Pillar of the Community
United States
3444 Posts |
Acetone will do no harm to a genuine coin. The only changes that might occur would be if the coin had been waxed or in the case of some bronzes I have had ........ painted !
Acetone is excellent for detecting and removing "improvements" made to coins.
Place coin on paper towel inside small glass jar.
Pour one or two centimeters of acetone into jar and close tightly !
Agitate gently
Make sure to keep away from flames ! Acetone vapor can be very explosive !!!
Not in a highly dangerous way but enough to remove your eyebrows and any unwanted nose hairs
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Pillar of the Community
United States
949 Posts |
As others have said, this is a beautiful coin. However, I do see a bit of discoloration in the obverse left field and the hair (left of the headband) and ear. I cannot tell if this is a true discoloration or the result of the lighting which is stronger on the right side of the obverse. If the tone of the obverse is uniform, then I would leave it alone. However, if there is a residue on the obverse left, then a very light "scrub" of the affected area with a que-tip soaked in acetone might be tested. Only test a small patch at first, and check the que-tip to see what it is picking up. Light circular strokes with almost no pressure; let the acetone do the work. If it changes the tone, then extend the "scrub" to the rest of the affected area. If nothing happens, I would leave it alone.
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Pillar of the Community
United States
3229 Posts |
I would leave it be. Store it in a non PVC flip and check to be sure it the area has not gotten worse every month - 6 months. You can try acetone as it should do no harm but I would recommend only a soak and skip the Q-tip if you have no experience conserving coins.
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New Member
14 Posts |
I apologize very much, but I'm not sure I can clearly understand what this is " Q-tip "? And how is it working with " Q-tip " ?I can not imagine what it is " Q-tip " ? Can anyone explain me by just example or pic! As I explained above, my English is not so good. But I hope you understand me right. Thank you . :)
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Pillar of the Community
 Spain
2752 Posts |
What you use for cleaning your ears   |
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New Member
14 Posts |
  Thank you !! |
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Pillar of the Community
United States
549 Posts |
I would (with 46 years experience) leave it alone. You can easily make the surface worse, but I doubt you can make it better. That almost invisible bit of greenish tinge is not enough to bother most collectors who know ancients.
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New Member
14 Posts |
Thank you ! I still hesitate, what to do.
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Replies: 20 / Views: 3,191 |
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Posted 12/29/2017 3:47 pm
