If you dilute the acid always add the acid to the
water....never the otherway around.
Mark M.
----- Original Message -----
Sent: Friday, July 18, 2003 12:21
PM
Subject: Re: [meteorite-list] etching
solution
Hello, Mark and the list,
think ferric chloride is
not strong enough to etch Fe / Ni, but havenīt ever tried...;-
You
can find a quite good recipe for the etching solution from R.O. Nortons
book Rocks from Space (page 415). There is also advised, how to check Ni
from the potential meteorites (page 417).
You should have the nitric
acid from the drug store, but if possible, please, check the recipe first,
you need also some other components to make the mix. If you use 100 %
nitric acid, the result may be, if not a catastrophe, but quite near
to that.
And even with not so strong solutions, latex
gloves and goggles should be worn to avoid to hurt yourself.
take
care,
pekka
Mark Jackson wrote:
Dear List,
I'm trying to locate etching solution capable of etching Widmanstatten
patterns to view on meteorites. I understand it's nitric acid? I got the
"bright" idea of checking my local electronic supply house for PC board
etching solution and it seems that ferric chloride is used to etch copper
from the breadboards. I got a B in college chemistry and that makes
me question the usefulness of using ferric chloride on a
meteo(rite/wrong). Am I correct in questioning this practice? Where can I
find, or how can I extract, nitric acid to use if I am correct?
Many thanks,
Mark
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Pekka Savolainen
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