Re: [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" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
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
[EMAIL PROTECTED]
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
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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