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A Tale Of Toning

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Pillar of the Community
m9frank's Avatar
United States
628 Posts
 Posted 05/22/2011  12:14 am Show Profile   Bookmark this topic Add m9frank to your friends list Get a Link to this Message Number of Subscribers
A few years ago I left a dozen or so common silver halves, Franklins and a Kennedy, in flips, that didn't sell at a flea market, in a black leather satchel for almost a year. In that time the coins started to tone to a nice grayish blue around the edges.

I have since tried other coins, including a 1835 CBH that has been dipped. No luck yet in over a year.

Maybe I should buy a new black leather satchel.
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GoThunder's Avatar
United States
830 Posts
 Posted 05/22/2011  12:39 pm  Show Profile   Bookmark this reply Add GoThunder to your friends list Get a Link to this Reply
Wow a year long experiment, cool. Maybe the humidity was greater the first time, did it rain at the flea market or something?

I had some unwanted toning on my 87 ASEs and started doing some research on how to stop this corrosion from happening to my new 2011 ASEs. Apparently sulfur is a big factor. I quote from this link: http://nautarch.tamu.edu/crl/conser...l/File13.htm


Quote:
Silver is particularly susceptible to the effects of the sulfide radical. This is best demonstrated by the formation of tarnish on silver objects that are exposed to sulfur in any form, particularly hydrogen sulfide and sulfur dioxide, which can convert to sulfuric acid.


One of my most heavily toned silver eagles was won at a shooting match and kept in a plastic flip for about 14 years. I suspect it was exposed to some sulfur from gun powder residue.
Edited by GoThunder
05/22/2011 12:45 pm
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