[pure-silver] Re: dichroic fog
- From: Eric Nelson <emanmb@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 4 Apr 2006 18:08:10 -0700 (PDT)
Sorry for the misleading subject for my HCA question!
Ryuji, why is it you don't use rapid fixer?
Just wondering.
Eric
--- Ryuji Suzuki <rs@xxxxxxxxxxxxxxx> wrote:
> > Since it has no effect on printing it's not a
> major
> > worry for me BUT it is annoying to follow
> procedures
> > and still get a bugaboo. It's only visible after
> > drying so hopefully, if need be, I can follow your
> > ammonium thiosulfate procedure for removing the
> "fog"
> > once dry.
>
> One consideration is that silver in dichroic fog may
> cause stain more
> easily than image silver during storage.
>
> > Can I use Kodak Rapid Fix with hardner (Solution
> "B"),
> > and add citric and metabisulfite to that? Do you
> have
> > a quantity of citric and metabilsulfite that you'd
> > recommend?
>
> Last time I used Kodak Rapid Fix was many years ago,
> but I think the
> pH of that kind of fix is about 4.5. Same for Edwal
> Quick Fix.
>
> In order to get the "gentle" bleach effect, you want
> to operate a few
> pH units lower. Crabtree published such "gentle
> bleach" somewhere (I
> think PSA Journal) and I use it myself. I'll try to
> pull that formula
> next time I go to darkroom.
>
> > When you say bleach, I assume you mean potassium
> > ferricyanide which I'd be loathe to bring near a
> > client's originals. =) Even though I'd be
> treating
> > the base side of the film, I could see it easily
> > creeping 'round to the the emulsion side! Would
> be
> > just my luck.
>
> I wouldn't recommend ferricyanide or other strong
> bleach. Highly
> diluted, they may be usable, but I would always test
> with unimportant
> specimen produced by the identical process.
>
>
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