[meteorite-list] RE: Nice Dronino?

[Jonathan Gore]

What about storing in a vacuum with a container of concentrated sulfuric 
acid after the alcohol/NaOH bath?

JKGwilliam wrote:
> Have any of you who are fighting with rust/decay problems with Dronino 
> tried storing with desiccant in an airtight container after treating 
> with the alcohol/NaOH bath?
> 
> 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:pekka.savolainen at dlc.fi] Sent: 
>>>>>> Thursday, November 25, 2004 5:33 PM
>>>>>> To: Stephen McMann
>>>>>> Cc: meteorite-list at meteoritecentral.com
>>>>>> 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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>>>>>>
>>>>
>>
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