[meteorite-list] Rusty droplets

[Thomas Webb]

'Iso' means "equal"!
  Thomas 
  

mark ford <markf at ssl.gb.com> wrote:
  Iso means 'pure' ...

Mark

-----Original Message-----
From: Pete Pete [mailto:rsvp321 at hotmail.com] 
Sent: 08 June 2007 13:13
To: mark ford; GiovanniSostero at libero.it;
Meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] Rusty droplets

Mark wrote:
..."Iso-alcohol (pure ethanol)"...

Hi, all,

I'm not a chemist, but the way you wrote that, it might be
misinterpreted by 
some to identify Isopropyl alcohol is the same as Ethanol, which it's
not.
The connection to each other is that both have been referred to as
"rubbing 
alcohol".

Cautions when using either with meteorites:

Don't use the 70% isopropyl - the 30% is water, which is what you want
to 
avoid. I use the 99% isopropyl and 95% ethanol without any ill effect
seen 
on the stones.

They are more flammable in these purer forms, so ventilate!

The fumes of isopropyl are poisonous! Ventilate.

Cheers,
Pete




From: "mark ford" 
To: "giovannisostero" 
,
Subject: Re: [meteorite-list] Rusty droplets
Date: Fri, 8 Jun 2007 09:14:57 +0100

Hi Giovani,

Yes firstly take them out of plastic! Any moisture/chemicals trapped in
the rock will stay in the rock if it is in plastic, you only want to put
dry, stable material into plastic boxes, (or use dessicant/silica gel
with the rock and recharge it regularly).

As Adam suggested you can also use Iso-alcohol (pure ethanol) it's good
for getting rid of moisture in extreme cases but make sure it is 'pure
anhydrous alcohol' or you will be putting more water in than you take
out! - also gently warm the slice afterwards to drive off any moisture
then sand with very very fine sanding paper.

They also preferably need to be kept somewhere dry like inside a cabinet
with dessicators inside, or better still a dehumidifier.

Most slices reach a stable point eventually once you have done this!

Best
Mark Ford





-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
giovannisostero
Sent: 07 June 2007 19:15
To: meteorite-list
Subject: [meteorite-list] Rusty droplets

Hi,
I noticed that a coupled of slices (Ghubara and NWA 869) I bought few
months ago from two different dealers, are producing some small liquid
droplets of rusty appearance. After cleaning, the droplets develope
again in a matter of few weeks. Any idea about how to cure it? The
samples are stored in plastic envelopes but without any particular
desicant.
Cheers,
Giovanni


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