Tips to clean the green off this large coin??

[kforbes862]

I got this coin in a lot of uncleaned's that i bought. this large coin has rough/sandy feeling green crust on it. what is the best approach to cleaning this one? It is a large coin, about 31mm, and i want it to come out nice without damage. would olive oil, distilled water, or something else be better?

[casata137ec]

Not trying to be a jerk or anything...but is there any reason you think there is somthing under the green? It looks flat/devoid of even somthing resembling a bump on both sides from the pic/scan is the only reason I am asking.

But back to your original question...I would boil in washing soda/dw for 15 minutes, soak in the same water over night, switch over to strait dw for the remainder of the time, and mechanically reduce the crust, vigourously brushing with a nylon brush periodically to remove loose debris.

Chris

[kforbes862]

Looking at the coin in my hand, i can see the outline of a bust, and what looks like ac or ao in a spot around the rim. i will try the soda boil. thanks

[renegade3220]

Careful with the boil. I have a strong feeling it is going to just rip that coin apart. I have had some like this and they are practically coins being held together by the patina over a rotten core and the detail you see is in the patina only.

On a side note, I would boil it too. It may work, it more than likely in my opinion ruin it though. Hut there is nothing toucan do about that. Lesson I learned. I actually have a topic on the one I ruined. If I wasn't on an iPhone I would find it for you. Ou may winthis battle, you may not...

[Mayadigger]

Ave!

Not trying to be a jerk or anything...but is there any reason you think there is somthing under the green? It looks flat/devoid of even somthing resembling a bump on both sides from the pic/scan is the only reason I am asking

Chris. Huh? You should really know better. This is a perfect coin for cleaning.

kforbes862, try this, okay?

4-5 five days soak in GG's 1, just to loosen the patina a bit. Use mechanical processes with a common dental pick to reveal the details. Then go to a SBBB in  battery-powered Dremel tool to buff off the high-lights. Return to hand-held tools to finish the process.

Piece of Cake, folks.

Best,

Kevin

[casata137ec]

Ave!

Not trying to be a jerk or anything...but is there any reason you think there is somthing under the green? It looks flat/devoid of even somthing resembling a bump on both sides from the pic/scan is the only reason I am asking

Chris. Huh? You should really know better. This is a perfect coin for cleaning.

kforbes862, try this, okay?

4-5 five days soak in GG's 1, just to loosen the patina a bit. Use mechanical processes with a common dental pick to reveal the details. Then go to a SBBB in  battery-powered Dremel tool to buff off the high-lights. Return to hand-held tools to finish the process.

Piece of Cake, folks.

Best,

Kevin

I really do not see anything to save. Maybe my eyes are getting old!   I really do want to see progress pics though.

Chris

[benito]

Avery short inmersion in sulphuric acid  (diluted)  can work miracles in seconds.

[Gallia Albanensis]

Looks like flaky green mixed with earthen crust.

Hydrogen peroxide works well on just about anything green on a coin (desirable or not), and also loosens organic earthen crust.

[Heliodromus]

Avery short inmersion in sulphuric acid  (diluted)  can work miracles in seconds.

Do you have any before/after photos of coins you've treated this way?

Ben

[DirtyBronze]

looks a little more modern than ancient to me ...maybe 17th 18th century and well worth a try