[meteorite-list] Etching Compounds

[stan .]

in my very Very VERY limited experience a solution of ammonium biflouride in 
phosphoric acid makes an excellet 'cleaning potion' for iron meteroties. I 
was quite skeptical of it's usefullness due to the flourine content, but the 
small sikhote i cleaned over a year ago is in perfect shape today - and it's 
a 'shower' - gets passed around to friends and sits around unprotected in 
the wet florida weather. a nice added bonus is that if left on a metal to be 
cleaned it leaves a layer of black iron oxide, somewhat hiding the cleaned 
areas in fusion crusted irons.



>From: "Adam Hupe" <raremeteorites at comcast.net>
>To: <meteorite-list at meteoritecentral.com>
>Subject: Re: [meteorite-list] Etching Compounds
>Date: Fri, 10 Sep 2004 12:45:53 -0700
>
>Hello List,
>
>This topic reminds me of the "Magic Cleaning Potion" we purchased from a
>hippie at the Denver show last year.  We figured it was a combination of
>acids after accidentally reverse etching some Tazas with it.  He was right
>this potion was capable of cleaning things. Not only did it etch our Tazas
>from the outside-in giving them a 3D appearance, it disintegrated a 2'
>square hole in our driveway after eating through a seam in a tin bucket. We
>can hardly wait to give this dude a piece of our mind this year as this
>potion gassed us out of our shop with a noxious brown cloud and damaged a
>bucket, ~ 400 grams of Tazas and our driveway.  Be careful when using any
>type of acids to etch or clean with.
>
>All the best,
>
>
>------------------------------------
>Adam Hupe
>The Hupe Collection
>Team LunarRock
>IMCA 2185
>raremeteorites at comcast.net
>
>
>----- Original Message -----
>From: <MexicoDoug at aol.com>
>To: <VeIocity at aol.com>; <meteorite-list at meteoritecentral.com>
>Sent: Friday, September 10, 2004 11:49 AM
>Subject: Re: [meteorite-list] Etching Compounds
>
>
> > Hola,
> > Concentrated nitric acid is about 16 molar (70%).
> >
> > You don't want any water you can avoid.  It is then diluted (by pouring
>acid into alcohol) down to "1 molar" (16:1 vol/vol), but in quotes because
>that should be with anhydrous, or 95% minimum ethyl alcohol....I usually
>consider "molar" as in water, hence the important clarification.
> > Doug
> >
> > careful and have fun drawing figures:)
> > ______________________________________________
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> > Meteorite-list at meteoritecentral.com
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>
>
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