RE: Albumen sensitiser question
Thanks for the input Judy. I checked my VDB solution and that has a
precipitate too but is quite different to the AgNO3 precipitate which is a
hard crystal. I did a couple of salt and albumen prints today sensitised
with some sensitiser I decanted and it worked fine. The only faults in the
images were operator error :)
From: Judy Seigel [mailto:firstname.lastname@example.org]
Sent: 02 February 2009 04:50
Subject: Re: Albumen sensitiser question
On Sun, 1 Feb 2009, John Brewer wrote:
> I made up some silver nitrate sensitiser according to James p 471, that is
> 15% silver nitrate plus 5% citric acid in distilled water.
> I see there is now some crystals at the bottom of the bottle. They weren't
> there when I made the solution up and sensitised some paper. I can't seem
> dissolve them, even with heat and vigorous shaking. What are they? Are
> anything to worry about? Can I filter or decant them out?>
For what it's worth, I mention my own experience with silver nitrate in a
different formula (vandyke brown). In time, a black precipitate appeared
in the bottle of solution which didn't disappear with shaking. However,
when I spread the emulsion on paper, the applicator apparently mixed it
back into solution.
Could that possibly happen with the crystals ?