| Author |
 Replies: 11 / Views: 2,730 |
|
|
New Member
United States
12 Posts |
I have taken a couple dozen coins to the local coin shop for their opinion of whether they were worth the cost of authenticating , the answer was simple ,no, the reason was'nt that the coins were'nt valuable but that it was obvious that there were obviously what I had listed them as on my 2x2s and graded about where I had from guesswork , but 2 coins are worrying me a bit a 1864 2c and a 1847 large c .both are in great shape with alot of detail , but the 1864 has 12 or so spot of green on the reverse they are just specs but they are mint green in color , and the 1847 has 1 spot between the s and t that looks like tar . I was told it would it would it would be ok 2 take them out of the 2x2s and wipe em with a cleenex with wd40 to preserve and put them in fresh 2x2s . but not worth the cost of authentication ? any opinions would be appreciated thanks
|
|
|
|
Valued Member
United States
124 Posts |
 I've never heard of using WD40 on a coin. I'm no expert, but I would be very, very careful about that advice. |
|
Moderator
 United States
23731 Posts |
It's not a good idea to use WD-40, there are chemicals in the oil that will re-act with the bronze and case damage to the coins and will remove the natural toning.
|
|
Bedrock of the Community
United States
10284 Posts |
I don't like the word "wipe" either.
|
|
Pillar of the Community
United States
1418 Posts |
|
|
Valued Member
Canada
464 Posts |
I never clean coins, so I don't know what to tell you... I know ancient coin collectors frequently have to deal with issues like "bronze disease", perhaps you could try posting in the Ancients section of the forum if you don't get the info you need in this one. I know specialized cleaning agents exist, at the cost of a few dollars. Check this link out, it may have info to help you: http://nobleromancoins.com/product_...a56c0605a69dI'm not sure if you should be using any of the products mentioned on that site, so be sure to get more info. before making a decision. Edited by gawd0wns
12/08/2009 4:09 pm
|
|
New Member
 United States
12 Posts |
I don't know what to do! if I have a coin with a spec of crap on it .060" think why should'nt I remove at least .055" of it ? no way to damage a coins surface if I dont touch it
|
|
Pillar of the Community
Australia
2830 Posts |
G'day,
I have heard of putting olive oil on the green bit, to slow its growth. I haven't tried it myself, but.
When I find a coin with "Green Disease", Verdigris, "Coin Cancer", whatever you choose to call it, I always quarantine it from the rest of my collection: perhaps I'm wasting my effort, but I feel better.
I have two containers: one with common date bronze-with green-spots, the other with black spots. I regard these as essentially valueless, and one day I intend to some experiments on them.
Back to the O.P. problem: anything akin to cleaning that you undertake with almost certainly be readily apparent; and will devalue your coin. i'd leave it as it is.
Peter in Oz
|
|
Pillar of the Community
United States
968 Posts |
Wouldn't putting those coins in airtight containers stop the growth? It sounds like it is corrosion on those coins, so if you remove the oxygen it should prevent further corrosion from occurring.
|
|
Valued Member
United States
124 Posts |
 I think Saruma has the best idea. If it is corrosion, there is nothing you can really do about it. If you are able to get the green spot off without doing further damage to the coin (hard to do), you are likely to find a spot of pitting underneath the corrosion that is no more attractive than the spot was. You haven't really gotten anywhere. If it were me, I'd think of a storage solution (like the airtite Saruma suggests) to halt further damage, and leave the spot alone. |
|
Rest in Peace
United States
1729 Posts |
I've had excellent success with using Goo-Gone on current, non-critical coins which have verdigris or tar on their surface, but I don't believe I'd fool with an older coin unless I had a very good reason to stop the spread of the verdigris. Can anyone comment on the chemical properties of Goo-Gone when applied to coins? I've mentioned using it before on this forum but don't recall anyone ever commenting on it. Olive oil seems to be the substance of choice, along with distilled water, as solvents for ancient, encrusted Roman coins, and it would be nice if Goo-Gone, which is relatively inexpensive and effective for crud removal, could be added to the list.
|
|
Bedrock of the Community
United States
12437 Posts |
pls, coppercoins has discussed his usage of Goo-Gone in the past. He uses it on Lincolns to remove crud around the date, mintmark, and other devices so he is able to properly photograph RPMs and doubled dies. I have not personally used it but coppercoins reports no ill effects in years of usage so I have faith in his methods.
|
| |
Replies: 11 / Views: 2,730 |
|
Posted 12/07/2009 9:50 pm
