Classical Numismatics Discussion
  Welcome Guest. Please login or register. Please look at the RECENT ADDITIONS and PRICE REDUCTIONS at the top and bottom of the page. All items are guaranteed authentic for eternity! Thanks for supporting Forum with your PURCHASES! Welcome Guest. Please login or register. Point your mouse to a coin in RECENT ADDITIONS or PRICE REDUCTIONS on this page to see the the price. All items are guaranteed authentic for eternity! Thanks for supporting Forum with your PURCHASES!


FORVM`s Classical Numismatics Discussion Board  |  Numismatic and History Discussions  |  Coin Photography, Conservation and Storage  |  Topic: BD? 0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: BD?  (Read 1305 times)
Vergilius
Praetorian
**
Offline Offline

Posts: 51


BD?
« on: November 19, 2008, 10:36:07 am »

I am not sure whether this coin has bronze disease or not, the photos is not that good, but you can see the green spots on the lower left at the obverse and at the top left at the reverse. It also has a small green spot like this on the edge, and the colour of is sharper green than on the photo, which makes me think of it is BD. On the other hand the condition for this coin has not changed for the worse during the two years I have owned the coin. The big question is if I should, with the risk of maybe destroying the patina, put it in Gringot #1 to be on the safe side or if I should assume that everything is OK and leave it as it is.

In advance, thank you for any replies!

Logged
Tiberiusjulius
Comitia Curiata
Caesar
****
Offline Offline

Posts: 456


« Reply #1 on: November 19, 2008, 12:49:40 pm »

Hard tell,but I think you are o.k.
Logged

Gavignano
Procurator Caesaris
Caesar
****
Offline Offline

Posts: 1488

"I check Forvm daily, and take a multivitamin."


« Reply #2 on: November 19, 2008, 06:37:16 pm »

Hi. I  can't tell from the photos. Your description sounds a little worrisome, but I also would expect, if is bronze disease, within a 2 year period more of an invasion showing up, especially in those cuts in the upper left of the obverse. Sorry I could not be of more help.
Logged

"May all your campgates be Ticinums"
Vergilius
Praetorian
**
Offline Offline

Posts: 51


« Reply #3 on: November 20, 2008, 06:43:37 am »

What is confusing for me about this coin, is the colour which is similar to other coins I´ve had with BD, but while matching BD in colour it seems to be harder (it does not go off with a toothpick) and as I said, it has not got any worse for two years. That makes me think that it might just be encrustions, but that also seems odd becouse of the very green colour which stands out from the rest of the patina.
Logged
areich
Tribunus Plebis Perpetuus
Procurator Monetae
Caesar
*****
Offline Offline

Posts: 8791



WWW
« Reply #4 on: November 20, 2008, 08:24:13 am »

YOu'll just have to go trough all the BD threads but I'm sure I've read that those hard green boils are also
(or can also be) BD.

Andreas
Logged

bruce61813
Conservator
Consul
***
Offline Offline

Posts: 245



« Reply #5 on: November 20, 2008, 10:03:11 am »

From the looks of the two pictures there are two spots that bother me.  One on each side. If this was one of my coins, I would use a needle to carefully remove as much of the pale green as possible, then soak the coin. The dark green is malachite and should not be disturbed by GG #1, not should the dark copper oxide. The two spots, if they are BD , will show raw copper, but that cannot be escaped, in that case, a bit of Deller's would reduce the contrast and then leave the coin in the open, it will darken further.

If they are BD, action right noe will prevent damage to a good looking Follis.

Bruce

Logged

too many coins - too little time!!
Vergilius
Praetorian
**
Offline Offline

Posts: 51


« Reply #6 on: November 20, 2008, 11:18:46 am »

Thank you for the help. Then I will soak it in GG #1 to be on the safe side. I really like this coin, and I now have an almost complete collection of the anonymous follis, so it is probably best not to take any risks with it  Smiley
Logged
bruce61813
Conservator
Consul
***
Offline Offline

Posts: 245



« Reply #7 on: November 20, 2008, 10:04:10 pm »

If you carefully pick open the areas that I circled, then soak with sone scrubbing in those areas, the reat of the coin should not change.  I would allow at least a week of soaking, scrub lightly daily, change the solution every two daus. I would not use less than 8 ounces to soak the coin in, the idea being to keep the concentration of chlorides from being able to build up in the solution, so the dissolution gradient is away from the coin. Besdies the carbonates tent to cause the bronze to darken depending on the alloy. I often fininsh with a soft brass brush on my battery powered dremel and the areas blend in without added toners.

Bruce
Logged

too many coins - too little time!!
Pages: [1] Go Up Print 
FORVM`s Classical Numismatics Discussion Board  |  Numismatic and History Discussions  |  Coin Photography, Conservation and Storage  |  Topic: BD? « previous next »
Jump to:  

Recent Price Reductions in Forum's Shop


Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.404 seconds with 36 queries.
zoom.asp