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Tetricus Turning Blue

 
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Pillar of the Community
United Kingdom
3626 Posts
 Posted 02/09/2015  12:03 pm Show Profile   Bookmark this topic Add pishpash to your friends list Get a Link to this Message
I have a tatty little Tetricus bronze which is worth about 50p and was about to be dumped into an ebay lot. However, I noticed that it is developing a blue hue. I have not noticed this with any other of my bronze coins.

I have had this coin for months, kept in a coin safe flip. Any thoughts as to what might be causing this? It was kept for a period in a room where we have a log burner, but in the flip in an album.

Photos are not meant to be in focus, but to try and capture the blue colour.



Pillar of the Community
United States
5155 Posts
 Posted 02/09/2015  12:53 pm  Show Profile   Bookmark this reply Add Ancientnoob to your friends list Get a Link to this Reply
The coin looks like it was cleaned down to bare metal and is starting to re-tone. I would imagne the coin is not copper but rather high copper content Billon or Potin. You wouldnt be the first person to tell me coins changed colors in a room with a log burner.
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United States
5155 Posts
 Posted 02/09/2015  12:59 pm  Show Profile   Bookmark this reply Add Ancientnoob to your friends list Get a Link to this Reply
You can see similar on my billon drachm of Rujuvula Satrap of Chach (BC 10- AD 10)

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 Posted 02/09/2015  1:24 pm  Show Profile   Bookmark this reply Add pishpash to your friends list Get a Link to this Reply
Interesting Nate. I might leave a couple of other coins in the room with the burner and see if anything happens. Coin certainly looks like a bronze rather than billon, but I am no expert in these matters.
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22890 Posts
 Posted 02/09/2015  2:12 pm  Show Profile   Check echizento's eBay Listings Bookmark this reply Add echizento to your friends list Get a Link to this Reply
It's a nice tone though.
Pillar of the Community
United Kingdom
3626 Posts
 Posted 02/09/2015  2:30 pm  Show Profile   Bookmark this reply Add pishpash to your friends list Get a Link to this Reply
It is not going to ebay now, I will see how it progresses. I will sort out a couple of other coins in different states and see how they get on. Probably the overcleaned ones will be better than those with a thick patina. We shall see, might be a new business for me. "Get your blue coins 'ere......"
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16356 Posts
 Posted 02/09/2015  4:30 pm  Show Profile   Check vermontensium's eBay Listings Check vermontensium's eCrater Listings Bookmark this reply Add vermontensium to your friends list Get a Link to this Reply
Cleaned, quite harshly/retoning.

I've seen copper/bronze tone almost every color.
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Pillar of the Community
United States
513 Posts
 Posted 02/09/2015  6:01 pm  Show Profile   Bookmark this reply Add chuy1530 to your friends list Get a Link to this Reply
Shoot, I'd keep it out of the flip and on the same side of the room as the burner for a while, see what happens.
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4208 Posts
 Posted 02/09/2015  6:32 pm  Show Profile   Bookmark this reply Add Ben to your friends list Get a Link to this Reply
If its been kept isolated then whatevers causing the toning is probably left over from cleaning (especially if nothing else is doing it).
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 Posted 02/09/2015  6:42 pm  Show Profile   Bookmark this reply Add pishpash to your friends list Get a Link to this Reply
Thank you Ben, I wish I know what had been used to clean it. I plan to keep it out of the flip, in a tub with some others, burner is in the dining room so it could be caused by burning the toast in the kitchen :)
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 Posted 02/09/2015  11:46 pm  Show Profile   Bookmark this reply Add Gil-galad to your friends list Get a Link to this Reply
After a harsh cleaning like that, a thin coat of oil wiped on with a soft cloth would help protect the coin. I've had to do this a couple of times when I purchased a coin that had been over cleaned.
Pillar of the Community
United Kingdom
3626 Posts
 Posted 02/10/2015  3:38 pm  Show Profile   Bookmark this reply Add pishpash to your friends list Get a Link to this Reply
I have another one turning blue. This time an AE4 of Honorius, taken right back to the metal. Bought from a different seller, I have had it for around a year or so. I received it back yesterday after it had been on holiday to the Netherlands for several months.
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