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Remove Horn Silver Without Damage

 
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Author Previous TopicReplies: 6 / Views: 1,217Next Topic  
Valued Member

Canada
167 Posts
 Posted 11/19/2018  11:47 am Show Profile   Bookmark this topic Add AlRashid to your friends list Get a Link to this Message
Hi Guys

Does anyone knows what is best way to remove the black patches of horn silver without damage/ affect the surface beneath it?

The coin I like to do this is below:


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United States
5901 Posts
 Posted 11/19/2018  11:57 am  Show Profile   Bookmark this reply Add Finn235 to your friends list Get a Link to this Reply
Can't be done. Horn silver is the original silver, chemically bonded to minerals from the soil. At best, once you scraped it off, all that would be left underneath is smooth silver from the core of the coin. Doing so would ruin the coin's value.
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Valued Member
Canada
167 Posts
 Posted 11/19/2018  12:01 pm  Show Profile   Bookmark this reply Add AlRashid to your friends list Get a Link to this Reply
Thanks alot Finn, but leaving it will not get worse right? Is there anything I need to know about preserving condition of such coin? I just don't want it get worse and breaks etc.
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United Kingdom
4208 Posts
 Posted 11/19/2018  12:23 pm  Show Profile   Bookmark this reply Add Ben to your friends list Get a Link to this Reply
Here is a thread with some comments about dealing with horn silver:

http://www.worldofcoins.eu/forum/in...?topic=654.0

There is firm disagreement between people on what horn silver can do to a coin. A lot of people say it is inert, while others say it progresses. I am yet to try treating horn silver, but I reckon I would be tempted to treat this one.
Valued Member
Canada
167 Posts
 Posted 11/19/2018  12:49 pm  Show Profile   Bookmark this reply Add AlRashid to your friends list Get a Link to this Reply
Thanks Ben. I appreciate your help and providing the link. I am also tempted to remove but donr want damage it. If it does not get worse I am happy to keep it as it is though.

By the way, what do you guys think of this nero coin? Is the encrustation a horn silver? Is it easy to remove these?

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United States
23066 Posts
 Posted 11/19/2018  2:31 pm  Show Profile   Check echizento's eBay Listings Bookmark this reply Add echizento to your friends list Get a Link to this Reply
As Finn stated there really isn't anything that can be done without damaging the coin. An acetone soak for a minute or two might help clean some of the dirt off but anything beyond that is not recommended.
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Australia
13347 Posts
 Posted 11/19/2018  5:14 pm  Show Profile   Bookmark this reply Add Sap to your friends list Get a Link to this Reply
Horn silver is silver chloride. So long as the silver is relatively pure (as it should be for an early Sassanian drachm) and the coin is kept away from sources of chloride in an acidic or oxidizing environment (eg. being buried again in salty, acidic soil) it should not spread further.

"Bronze disease" on bronze coins (or on debased silver coins) can spread because it is mostly composed of hydroxides; it can suck everything it needs to spread out of moist air.
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