[pure-silver] Re: dichroic fog
- From: "Ryuji Suzuki" <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 04 Apr 2006 21:12:52 -0400
I use rapid fixer for most applications.
I make ammonium thiosulfate-citric acid bleach from scratch, because
it's better to do so, rather than relying on a proprietary product for
off-label use.
There are some reasons why one might want to consider using nonrapid
fix. Ammonium ion is not very desirable to dump into drain in large
quantity, even if silver is recycled. But as far as I know this topic
didn't come up in this thread...
On Tue, 4 Apr 2006 18:08:10 -0700 (PDT), "Eric Nelson"
<emanmb@xxxxxxxxx> said:
> 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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