From: Richard Morris (richard.morris@brunel.ac.uk)
Date: 06/27/00-01:38:19 AM Z
I totally support Judy's comments as to the quality of silver nitrate
brands etc. It does make a difference but along with paper quality, water
quality, sun quality etc, there are so many variables in salt printing as
to make it most unscientific! As I said in my earlier response that is what
makes it exciting; to achieve a colour or whatever and try to reproduce it
again. I have achieved near blues and reds but never been able to reprodice
them even from the notes I made.
Richard Morris
On Mon, 26 Jun 2000 15:16:22 -0400 (EDT) Judy Seigel <jseigel@panix.com>
wrote:
>
>
> On Mon, 26 Jun 2000, edzachary wrote:
>
> > Occasionally, there seems to be an effort to make alternative
> > processes more "mysterious" than they really are. Methinks the
> > attribution of colour variences in Salt Prints to the BRAND of silver
> > nitrate used my be one on those occasions!
> >
> > Ed
> > --
>
> Ed, if you're a chemist, this offer is null & void, but my bet would be
> that BRAND of silver nitrate might well matter. After all, where did they
> get their bullion, what mine was it from, what fire did they forge it in,
> what about their nitrate, I mean what had the nitrate touched before it
> got into the silver, what's in the packing material, etc. etc. etc.
>
> I have found MAJOR differences in color from what was in the tray before
> the toning solution (in silver gelatin), even tho tray had been rinsed,
> one drop of runoff probably remained, and, as the chemist explained,
> "there are millions of ions in everything."
>
> Not only brand, incidentally, but batch and lot number can be hugely
> different from same mfr... including of course gum arabic. Who would
> scoff at these variables may face even MORE mysterioso, or oblivion to
> fine distinctions -- or both.
>
> Judy
>
>
Richard Morris
Brunel University, UK
richard.morris@brunel.ac.uk
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