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Cleaning burnt coins

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Valued Member
Australia
413 Posts
 Posted 12/19/2006  7:36 pm Show Profile Bookmark this topic Add b_j_w_79 to your friends list Get a Link to this Message

I'm not sure if something similar has been posted before but is there a good way of cleaning coins the have been burnt/involved in a fire? My parents house has burnt in the recent bushfires and we found some coins after. Any help would be greatly appreciated!

Ben

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Australia
11238 Posts
 Posted 12/20/2006  06:04 am  Show Profile Bookmark this reply Add Sap to your friends list Get a Link to this Reply
Sorry to hear about your loss. Hope the folks are holding up OK.

Fire-burnt collectable coins are always tragic... I don't think there's much that can be done. Burning usually results in a very thick layer of oxides forming on the surface, as well as subsidiary chemical reactions with anything the coins were sitting in/on or that fell on them during the fire.

You could try the standard archaeological treatments - a fire basically does a few thousand years worth of damage in minutes. An ammonia soak for silver, a longer soak in olive oil or distilled water for coppers. Not sure what to do about cupronickel or al-bronze. But any sort of treatment like that done to a modern coin will make it look "cleaned", so either way its collectable value is greatly diminished.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Pillar of the Community
United States
4589 Posts
 Posted 12/20/2006  08:40 am  Show Profile Bookmark this reply Add scoutjim99 to your friends list Get a Link to this Reply
Sorry to hear about that b_j_w_79 Hang in there and I hope everyone is well
Valued Member
Australia
413 Posts
 Posted 01/01/2007  11:57 pm  Show Profile Bookmark this reply Add b_j_w_79 to your friends list Get a Link to this Reply
Thanks for the help and the thoughts! Will see what I can do.
Pillar of the Community
Australia
1360 Posts
 Posted 01/02/2007  02:55 am  Show Profile Bookmark this reply Add Snooba to your friends list Get a Link to this Reply
b_j_w_79, I am really sorry to hear about your parents loss. I hope that things improve for them!
Pillar of the Community
Australia
872 Posts
 Posted 05/29/2009  9:36 pm  Show Profile Check Jeff's eBay Listings Bookmark this reply Add Jeff to your friends list Get a Link to this Reply
Probably way to late for Ben but lots of information here...http://metaldetectingworld.com/clea...n_coin.shtml.
I would not recommrnd most of the techniques for collectable coins but, if you have nothing to lose with badly damaged coins, could be of use.

I would be interested in comments.
Me? I am rushing off to see if I can find some Aqua Regia (prepared by mixing three parts of concentrated Hydrochloric acid (HCl) with one part concentrated Nitric acid (HNO3) followed by dilution to about 1:10 -NOTE: Aqua Regia is the only acid that will dissolve gold and platinum). Nitric acid is very corrosive -will even dissolve glass!
Just the thing to soak my gold coins in; NOT.

cheers
Jeff
"If you want to know what God thinks of money, look at the people He gives it to." Joe Moore
Formerly nancyc
Australia
3718 Posts
 Posted 05/30/2009  08:20 am  Show Profile Bookmark this reply Add Nevol to your friends list Get a Link to this Reply
b_j_w_79, I don't know if it would be of any use for burnt coins, but Bigfella (Shane) sells a concentrated solution that removes gunk from coins. I've found that if coins are left in the diluted solution too long, they tend to lighten in colour. From memory the solution was originally made by a chap on another forum who's ID was Niksfree.

You could send Bigfella (Shane)an email & ask him if he thinks it might work. He's a member here & has a coin shop in Newcastle. http://www.newcastlecoins.com.au
A friend is a present you give to yourself.

Nancy
Pillar of the Community
Australia
2819 Posts
 Posted 05/30/2009  09:20 am  Show Profile Bookmark this reply Add Peter THOMAS to your friends list Get a Link to this Reply
be careful !

"Johnny took a drink one day,
but Johnny shall drink no more:
for what he thought was H2O,
was H2SO4 ..."

Peter
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