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Bronze Disease On Straits Settlements 1845 Halve Cents?

 
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Author Previous TopicReplies: 5 / Views: 230Next Topic  
Valued Member

Singapore
97 Posts
 Posted 09/21/2022  08:10 am Show Profile   Bookmark this topic Add Coins Mania to your friends list Get a Link to this Message
Hi,

Need opinion if there is bronze disease on this piece.



Thanks all
Moderator
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United States
24749 Posts
 Posted 09/21/2022  09:51 am  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
@coin, not sure that it is, but if since you suspect it, you definitely need to quarantine this coin from your others.

Is the green adherent or powdery?
"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
Valued Member
Singapore
97 Posts
 Posted 09/21/2022  10:01 am  Show Profile   Bookmark this reply Add Coins Mania to your friends list Get a Link to this Reply
@Spence,

Adherent. Is there difference if adherent or powdery? By the way how would you grade the coin? Can anything be done with the coin?

Thanks
Pillar of the Community
United States
579 Posts
 Posted 09/21/2022  11:45 am  Show Profile   Bookmark this reply Add livingwater to your friends list Get a Link to this Reply
If the corrosion is not powdery it means it's stable and not active. If powdery then verdigris is active and can destroy the coin, it needs some conservation. There's a big difference between conserving a coin and cleaning it. Do some research about techniques to conserve a coin. For example some lightly dip silver coins in acetone that does not damage the surface. Most collectors say DO NOT clean a coin, especially with anything abrasive.

There is a product called Verdi Care some have used, including me that won't clean the coin but will help it's appearance and help stop further corrosion.

In the search line here on CCF, type in Verdi Care and "coin conservation" "copper cleaning" etc. and you'll see posts about this.

Some have used a method of soaking an ancient coin in water then baking it in an oven to get rid of verdigris. But I repeat, do your research, learn about various methods before trying something like this! You could ruin the value of a coin if you mess up. There are pros who conserve coins, such as at PCGS and NGC, but I don't know how much they charge, would be worth it for a high value coin.
Edited by livingwater
09/21/2022 12:00 pm
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United States
24749 Posts
 Posted 09/21/2022  7:33 pm  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
@coin, sorry for not being more clear. When you pick at the green with the tip of a wooden toothpick, does it come off or stay stuck to the coin?
"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
Valued Member
Singapore
97 Posts
 Posted 09/22/2022  11:22 am  Show Profile   Bookmark this reply Add Coins Mania to your friends list Get a Link to this Reply
Come out from the coin.
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