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Bronze Medallion: Green Spot/Bronze Disease Cleaning Suggestions

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 Posted 05/27/2021  6:59 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
You'll find Verdi-Care eventually, and it will work, but what you'll likely see instead of a green spot is a contrasting light spot in its place.
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Slovenia
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 Posted 05/28/2021  10:39 am  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
Thanks for the info/encouragement. Light spot is better than the green spot, I guess. The spot must have formed only recently (perhaps during transit?). The listing photo did not show it:
Edited by Artemis737
05/28/2021 10:47 am
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 Posted 05/28/2021  11:01 am  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Takes quite a while for verdigris to form. Something fishy here.
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Slovenia
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 Posted 05/28/2021  11:12 am  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
Are you sure it's verdigris? It looks soft, like a green droplet. Purchased distilled water and pure acetone. For how long should I soak it in the distilled water?
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 Posted 05/29/2021  4:21 pm  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
After 24hr bath in distilled water and 40 minutes bath in pure acetone. What do you think, should I repeat or wait for Verdi-Care?:
Hope it's OK to use (pure) acetone on a bronze coins/medallions...



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 Posted 05/29/2021  4:22 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Looks pretty darn good to me! Congrats!
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Slovenia
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 Posted 05/29/2021  4:43 pm  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
Thank you, Coinfrog! Thanks to this forum, I'm always learning new things. ;)
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 Posted 05/29/2021  6:36 pm  Show Profile   Check Lancek's eBay Listings Bookmark this reply Add Lancek to your friends list Get a Link to this Reply
I'm with Coinfrog. First pic with the angle showing under the plane looks like verdigris. But in an early stage. Which is good, you took care of it before it caused any pitting. But I think it had been there a while. Prob some creative photog from the seller.

I bet that's why you see a light spot now. The rest of the medal had toned, while the verdigris covered spot did not. Which is another reason I think the spot has been there a while. Newly exposed metal surfaces tend to tone faster. So I bet that spot catches up with the rest of the medal. 2 years for now you won't see it.

And yes limited 100% acetone soak is fine on most metals. Just get the stuff from the hardware store. Not the nail polish remover.

Learned the hard way that not all metals can take a long term soak. I've got memory issues. So I just plain forgot I put a Haitian copper penny in the acetone. Realized it days later. The copper was pitted. Also had a silver coin in there. No pitting, but it had picked up some dark spotting. Almost like some of the copper had transferred to it.

Now I leave a light on over my work area when soaking anything.
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 Posted 05/30/2021  09:07 am  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
Thank you for the comment, Lancek. You may be right; paid only $10 for the Grumman medal. Currently, I'm focusing on space related coins/medallions. Also have the A14 Franklin Mint mini coin, which, like many others, acquired this black tarnish on the edge (not sure if it's removable from the presentation though). Any suggestions?

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 Posted 05/30/2021  7:25 pm  Show Profile   Check chafemasterj's eBay Listings Bookmark this reply Add chafemasterj to your friends list Get a Link to this Reply

Quote:
Currently, I'm focusing on space related coins/medallions.


Please oh please start a thread or share your space related finds here. I for one would love to see what you've acquired.
Check out my counterstamped Lincoln Cent collection:
https://www.coincommunity.com/forum...IC_ID=303507
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 Posted 05/30/2021  10:40 pm  Show Profile   Check Lancek's eBay Listings Bookmark this reply Add Lancek to your friends list Get a Link to this Reply
Natural toning often caused by the cardboard. Nothing that will damage the coin like verdigris would. Acetone generally won't removing toning, nor would soap and water. The toning may darken and expand a little, but over the course of years if not decades. Not a big deal to collectors usually.

There are dips available that can remove toning. But with those you risk doing more harm than good. I'd leave it as is.

A plastic holder that old is probably the type of vinyl that can cause green slime. So make sure it is not in contact with the coin anywhere.
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 Posted 05/31/2021  1:42 pm  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply

Quote:
After 24hr bath in distilled water and 40 minutes bath in pure acetone.
Looking good!


Quote:
What do you think, should I repeat or wait for Verdi-Care?:
I think it is in a good place now.


Quote:
Hope it's OK to use (pure) acetone on a bronze coins/medallions...
Just avoid direct sunlight during the process and you will be fine.
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Slovenia
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 Posted 06/04/2021  9:08 pm  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
Great community, thank you for your replies. Regarding my collection, I'm a rookie collector and so far I obtained most of the early Manned Flight Awareness medallions (from Apollo 8 to STS-1). The highly sought after flown Robbins medallions are still missing. My collection is slowly, but surely growing though.
As a child I also found a few coins from Habsburg monarchy period. I gave them to a chemist for preservation and have never seen them since...
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Slovenia
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 Posted 07/02/2021  11:51 am  Show Profile   Bookmark this reply Add Artemis737 to your friends list Get a Link to this Reply
Hello again, I recently obtained Martin Marietta Viking 1 medallion. Seems like it's made of aluminium. It has a few spots and is already in the distilled water. Would you recommend acetone treatment as well?

Illustration photo only:
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 Posted 08/01/2021  10:02 am  Show Profile   Bookmark this reply Add Eagle_Eye to your friends list Get a Link to this Reply
Hi there!
That's a neat Medal!
I love aircraft!

So I noticed something.
Your pic with the verdigris spot on it, look at the listing photo that doesn't show that green spot.
On the sellers picture, there is what appears to be a small die gouge just southeast of the N of Grumman.
That die gouge is Not on the picture you posted.
Your pic shows what looks like MD off the front of that Northrop-Grumman AWACS or E2 Hawkeye just to the east.
The sellers photo doesn't show that MD off the nose.
Even the after cleaning photo doesn't show that die gouge.

I don't think the medal in the listing is the medal you received.
That's what I think.

EE
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