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Ancient Coin Conservation

 
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Author Previous TopicReplies: 3 / Views: 271Next Topic  
Valued Member
Lebanon
270 Posts
 Posted 10/19/2020  5:09 pm Show Profile   Bookmark this topic Add chronos to your friends list Get a Link to this Message
I have a question out of curiosity .How to conserve ancient coins specially bronze one ? does coin holders matrix protect them from rust?
Bedrock of the Community
Australia
17604 Posts
 Posted 10/19/2020  7:09 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I don't think the idea is as much in vogue now as it used to be, but
museums in the past often protected ancient bronze coins with a colored wax coating, after they had been cleaned after recovery from ground burial.
The was has a direct contact with the surface of the coin.

Even now, I use a black canuba wax as a polish for black cars. It works really well, and hides minor scratches.
In both cases, the wax inhibits the slow oxidation of the surface underneath.

As a parallel, pure metallic sodium is normally stored under liquid parrifin or similar, to stop spontaneous oxidation from the atmosphere.

Plastic airtight coin storage capsules may be useful, but they do not suit the display needs of most museums.

It may be useful to do a google search on the various ways in how museums conserve and protect their coins.
Pillar of the Community
United States
1101 Posts
 Posted 10/19/2020  7:54 pm  Show Profile   Bookmark this reply Add Kushanshah to your friends list Get a Link to this Reply
The enemy of bronze coins is humidity, which can trigger bronze disease under certain conditions. Poor cleaning techniques can leave bare metal or acid contamination. Keep bronzes dry and away from soft plastics. Check them periodically for signs of active corrosion.
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United States
752 Posts
 Posted 10/20/2020  7:30 pm  Show Profile   Bookmark this reply Add travelcoin to your friends list Get a Link to this Reply
I have used Renaissance Wax "RenWax" as curiosity. I like that it darkens a coin a bit, but to be honest, I have only used it on a few treated Bronze Diseased coins.

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