From: Christina Z. Anderson (zphoto@montana.net)
Date: 09/09/02-09:14:08 PM Z
It seems that from what everyone is saying, it would be best for me to
choose the formula that does not contain nitric; there are a number of
different formulae, and it wasn't that I was going to substitute nitric for
another acid in a formula willy nilly, but use the formula that contained
nitric instead of one that contained another type acid. Actually, with all
the formulae I have (they are bleach etch formulae) the ones that contain
nitric acid usually have copper sulfate in the formula, the ones that have
copper chloride in the formula have the more benign acids such as acetic and
citric.
The nitric that Tri-Ess sells is 70%. It is interesting that UPS will
still ship it, it is not listed as hazardous nor does it have a hazard
charge. Oxalic acid does, for instance.
Chris
----- Original Message -----
From: <PhotonTom@aol.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, September 09, 2002 7:46 PM
Subject: Re: acids
> CAREFUL ! You don't have to be chemist, but you have to pay some
> attention to chemistry.
> The strength of the acid is not the entire matter. (Acetic acid is
conisered
> a "weak" acid as it does not ionize as strongly as Hydrochloric or
> Nitric...also sulphuric is a very strong dehydrator. The chemical
reactions
> that take place with an acid depend upon the type of acid... simple
examples:
> Mix lye (Sodium Hydroxide) with Hydrochloric and you get Sodium Chloride
> (table salt),, mix it with sulphuric and you get Sodium Sulfate etc.,
etc.
>
> If you are using an acid JUST to get an acidic solution then any will
work,
> but that's not rarely the case. And depending upon what else is in the
> witche's (or wizard's) brew, might get undesired results.
> (BTW mix concentrated sulphuric with concentrated nitric and soak
> paper...cellulose..in it, wash well and you have "flash paper"...gun
> cotton...can do some real old fahioned flash photography... :-)
>
>
> Cheers,
>
> Tom Crowe
> Thomas Crowe Studios-Photographic Arts
> Lost somewhere in East Tennessee
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