[meteorite-list] Etching Portales Valley

From: Michael Farmer <farmerm_at_meteoritecentral.com>
Date: Thu Apr 22 10:07:05 2004
Message-ID: <001d01c2811f$857371e0$df000140_at_computer>

Herbert, there is nothing special you need to do to etch Portales Valley, it
etches like any other iron. You do not need to cover it with Lacquer, just
take care of it in your moist environment
Mike Farmer
----- Original Message -----
From: "Herbert Raab" <herbert.raab_at_utanet.at>
To: "Meteorite List" <meteorite-list_at_meteoritecentral.com>
Sent: Thursday, October 31, 2002 12:56 PM
Subject: [meteorite-list] Etching Portales Valley


>
> Hello List,
>
> I have a nice 16.4g complete slice of Portales Valley with some large
> metal veins and fusion crust. Now I am thinkling about etching the slice
> to bring out the Widmanstäten pattern in the metal. Is there anything
> special I need to care about when etching Portales Valley?
>
> I have etched several of my iron meteorites, and even a large iron nodule
> in my 28g slice from the Estherville mesosiderite. But I have never etched
> a ordinary chondrite, so I though I rather ask...
>
> Would the experts on this list also recommend to lacquer the slice after
> etching? My slice is currently not covered with lacquer, and there is not
> the slightest amount of rust visible now. But can the acid make the iron
> start to rust? Is there any danger that the nitol used for etching or the
> alcohol used for cleaning the specimen would destroy the thin fusion
crust?
>
> Thanks for your help,
>
> Herbert Raab
> Linz, Austria
>
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Received on Thu 31 Oct 2002 03:53:07 PM PST