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Suggestions For Removing Bronze Oxidation.
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GeorgeI View Drop Down
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    Posted: 20 Jun 2020 at 20:23


This is a 6" x 1" Zhou through Han dynasties, 1027 BC to 220 AD bronze ritual dish.

When first discovered on the floor of a fresh water lake, it had additional crusty/flakey like oxidation that came off fairly easy.  It is now left with the oxidation shown, that is hard and firm to the base bronze.

There are very detailed and beautiful motifs beneath and would like to know if you guys might know of a way it can be separated from the bronze.  It is hard enough and firmly stuck enough to the bronze that I do not want to attempt any kind of stiff brushing and the like for fear of damaging the underlying motifs.

There are still some traces of what looks like malachite.

Any help greatly appreciated ! 






Here are a few pictures taken under  a Fluorescent light.







Here are a few taken in the sunlight.










Edited by GeorgeI - 26 Jun 2020 at 08:29
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Vanuatu View Drop Down
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Points: 2884 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Vanuatu Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 00:40
Hi GeorgeI, welcome!

I will make an inquiry, exceptional item!
Still round the corner there may wait, a new road or a secret gate. (J. R. R. Tolkien)
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Points: 529 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Novosedoff Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 02:44
The easiest way to clean the bronze item is to use lemon juice mixed with soda or vinegar mixed with salt
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I see my personal historic mission in bringing madness to juvenile masses.
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Points: 10968 		Post Options Post Options   Thanks (1) Thanks(1)   Quote franciscosan Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 12:39
I would suggest you stick to the recommendations on forumancientcoin.  Do you feel like you _have_ to do something?!?  You might try to find a restorationist who deals with bronzes.
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GeorgeI View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GeorgeI Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2020 at 09:03
I could use some help..

Had an XRF test done today with an Olympus tester.

98% copper
1% lead
Less than 1% iron

Not sure what to make of the test results.  It seems if this were a Chinese piece, the results would be a good sign. But not sure what these numbers mean for early Middle Eastern copper. 
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Points: 10968 		Post Options Post Options   Thanks (0) Thanks(0)   Quote franciscosan Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2020 at 13:02
What does XRF stand for?  I wonder about trace elements, most analyses I see include trace elements.  Refinement processes not being what they are today.  Thinking of bronze and silver Roman coins specifically.

X-ray florescence?
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GeorgeI View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GeorgeI Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2020 at 14:21
Originally posted by franciscosan franciscosan wrote:

X-ray florescence?

Yes.. 
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GeorgeI View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GeorgeI Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2020 at 08:27
With a little more research, it looks the surface material may be the results of something called, "bronze disease", a form of corrosion that affects copper, and copper based artifacts.
 
Here is just one example showing bronze disease for a copper coin, and a little reading from a metal detecting website, https://www.metaldetectingworld.com/cleaning_coin_p3_patina.shtml


There are chemical bath solution methods for removing, but I am reluctant to try them. https://www.metaldetectingworld.com/cleaning_coin_p17_copper.shtml

Edited by GeorgeI - 26 Jun 2020 at 10:44
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