I can remember Steve Shoner telling the list about using the alcohol/NaOH solution bath. As best as I can remember, he was the developer of this process and had tested it over a long period of time. Two weeks in the bath might not be enough. If the solution becomes discolored, put the specimen in a fresh batch of the solution and remember to stir it gently every day. Some stubborn meteorites might take months in the solution to produce the right effects.
Maybe Steve can enlighten us one more time on this subject.
Best,
JKG
At 09:23 PM 11/25/2004, Jonathan Gore wrote:
I thought it wasn't a good idea to store meteorites in plastic bags. I would think storing it in a bell jar with the air evacuated would stabilize it.
Just a thought....
Jonathan
Pekka Savolainen wrote:Nope, as far as I know. This mirror-polished fellow was stored in the air-tight plastig-bag, and some 10 months it was a real beauty. Then it started to rust very fast, or in fact not only to rust, perhaps "boiling" is a good word for the process...;- The beauty today; http://www.dlc.fi/~nuuska/dronino.jpg best, pekka s Jonathan Gore wrote:
Would storing it in a vacuum work?
Pekka Savolainen wrote:
Well, have tried everything except black magic and woodoo...;- Dronino is a quite old one, accordindg Verdansky from before 12:th century. Main part of the pieces was found from the very wet area, so I suppose, the chlorides are not the only problem..., the meteorite is just too old and have spent too much time in a wet soil.
http://www.geokhi.ru/~meteorit/dronino1-e.html
As I told in my former e-mail, after all tricks my pieces stayed stable some 8 - 10 months, the pieces without any methods to stabilizie them couple of weeks, not much longer.
If some happens to find to way to stabilizate this very interresting meteorite indeed, please, let me know...
best,
pekka s
Stephen McMann wrote:
Dear Pekka and List,
Has anyone ever tried some of the tried and true iron stabilization techniques on Dronino, such as a long bath in an alcohol and NaOH rich solution to remove chlorides? On a related subject, I guess that I may not really understand the chemistry behind why some meteorites are stable, and some are not. Perhaps I will naively ask, "Is it all about chlorides?"
Sincerely,
Stephen McMann
-----Original Message-----
From: Pekka Savolainen [mailto:[EMAIL PROTECTED] Sent: Thursday, November 25, 2004 5:33 PM
To: Stephen McMann
Cc: [EMAIL PROTECTED]
Subject: Re: [meteorite-list] Nice Dronino?
They are not stable. The older pieces was slag in a few weeks or months,
the new "stable" ones in 8 - 10 months. I have just one very thin piece not
distroyed, just because it has a quite heavy lacquer. Fastest ruster I have
ever seen ;-
best,
pekka
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