AW: [meteorite-list] Ensisheim

From: Jörn Koblitz <koblitz_at_meteoritecentral.com>
Date: Wed Jun 15 09:58:38 2005
Message-ID: <492FFD0696089A4CB72BDBDCB2FC1A14029AE2_at_server2000>

Dear Vincent,

> Then, I put it in a Tupperware full with isopropilic alcohol...

This was certainly the wrong way, because:

alcohol (ethanol as well as isopropanol) is quite hygroscopic, i.e. it will absorb a lot of water. Even if you seal the plastic bag, it does not work as humidity will diffuse through the wall. At the end, you have worsen it as it doesn't make a big difference whether you put it in pure water or in a mixture of water and alcohol.

Alcohol is only good for pulling off liquid water from a specimen after it has been dipped in water. Even then, the specimen has to be dried in an oven to get the remaining humidity off.

My advice: always store known rusters under desiccant. Best is to use silica geel with color indicator (cobalt) so you see when its time to change it. If the storage box isn't really hermetic (.e.g plastic boxes), you have to change and re-generate the desiccant quite often.

Cheers,
J?rn



> -----Urspr?ngliche Nachricht-----
> Von: vincent stelluti [mailto:stelvino_at_videotron.ca]
> Gesendet: Mittwoch, 15. Juni 2005 15:34
> An: J?rn Koblitz
> Betreff: Re: [meteorite-list] Ensisheim
>
>
> Hello Koblitz,
>
> I bought the slice in June 2002,
>
> In august 2002, the slice starts to fell apart.
>
> Then, I put it in a Tupperware full with isopropilic alcohol
> at 99,9% and I
> sealed the Tupperware in a plastic bag. I was waiting to
> find a solution.
> But I forgot it there and I opened the Tupperware last week.
>
> I found no more alcohol and the Brahin in very bad shape.
>
> Vincent
>
>
>
> ----- Original Message -----
> From: "J?rn Koblitz" <koblitz_at_microfab.de>
> To: "vincent stelluti" <stelvino_at_videotron.ca>
> Sent: Wednesday, June 15, 2005 9:26 AM
> Subject: AW: [meteorite-list] Ensisheim
>
>
> Hello Vincent,
>
> A nice slice (before). Although I don't know this dealer, I
> would be careful
> to blame him on this. Brahin is well known as a heavy ruster.
> If you don't
> store the material in a very, very dry environment (e.g. Excicator
> w/desiccant), noone can really guarantee for a "lifelong"
> integrity of such
> material (even if some do). However, I must admit that the
> slice (after)
> isn't in a very good shape indeed. When did you buy the slice?
>
> Best regards,
> J?rn Koblitz
>
>
> > -----Urspr?ngliche Nachricht-----
> > Von: meteorite-list-bounces_at_meteoritecentral.com
> > [mailto:meteorite-list-bounces_at_meteoritecentral.com]Im Auftrag von
> > vincent stelluti
> > Gesendet: Mittwoch, 15. Juni 2005 14:54
> > An: meteorite-list_at_meteoritecentral.com
> > Betreff: [meteorite-list] Ensisheim
> >
> >
> > Hello Brahin Lovers,
> >
> > I bought a nice (before) Brahin in Ensisheim Show from Neith
> > Investment Ltd.
> >
> > The dealer is from Russia I think. I paid 264 $ for 88 g.
> >
> > You can see two pictures, before and after here:
> >
> >
> >
> > http://www.colvir.net/prof/vincent.stelluti/
> >
> >
> >
> > Somebody knows if Neith Investment is in Ensisheim the
> next weekend?
> >
> > I will go to Ensiheim ...
> >
> >
> >
> > Thanks Vincent
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> > http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
>
>
Received on Wed 15 Jun 2005 10:04:18 AM PDT