Mark
Do you really mean nitric acid in ethanol?. It is many years ago and memory
can tricks but I am sure in my days as an organic chemist the technique for
removing residues from the bottom of glass flasks --- residues that had
resisted all the usual cleaning techniques, solvents etc -----. was to put
in a few ml of ethanol followed by about the same amount of conc nitric.
Nothing happened for a few moments then there was a sudden vigorous reaction
with the copious evolution of brown fumes of NO2.
George Twigg
----- Original Message -----
From: Mark Hall <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, October 29, 2000 5:39 PM
Subject: Re: Metals under a light microscope
> Your best bet, if you can find a copy, would be to pick up any of the
> versions of the ASM Handbook on Metallography. Its volume 8 or 10
depending
> on the edition.
>
> There are a variety of acids and bases that get used as etchants,
depending
> on the features you wish to show. Steel and irons are usually done in
1-5%
> solutions of nital (nitric acid in ethanol) or picral (a dilute picric
acid
> solution).
> These two are just listed as examples.
>
> Best, Mark Hall
>
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