[pure-silver] Re: Tray development and fog
- From: "Eric Neilsen Photography" <eric@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 22 Jan 2006 10:49:55 -0600
Mike, After doing some sheet processing this week, I had another thought for
you.
Does the fog occur from sheets that you unload and process? or just sheets
that are stored for batch processing? Not all storage is the same.
I use Bergger's BPFB 18 for making enlarged negatives for platinum printing.
I am not impressed with the packaging of their large sheets films; 16x20 or
20x24. Sheets that are against the thin press board inside the bags, have
fogged the film where the film in the middle of the package or fine. It
doesn't matter if it is the top sheets or the bottom sheet. Where ever the
film is in contact with the paper it is fogged.
I don't know if you batch process, or process directly from holder, but it
is something to be aware of in the future.
Eric
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of Michael Healy
> Sent: Tuesday, January 17, 2006 11:01 PM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: Tray development and fog
>
> I'll give this a try. It's a busy week, so I've had to hold off on
> processing. When I get
> results, I'll follow up. Thanks!
>
> Mike
>
> On 15 Jan 2006 at 18:28, Richard Knoppow wrote:
>
> From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Subject: [pure-silver] Re: Tray development and fog
> Date sent: Sun, 15 Jan 2006 18:28:30 -0800
> Send reply to: pure-silver@xxxxxxxxxxxxx
>
> >
> > ----- Original Message -----
> > From: "Michael Healy" <emjayhealy@xxxxxxxxxxxxx>
> > To: <pure-silver@xxxxxxxxxxxxx>
> > Sent: Sunday, January 15, 2006 4:54 PM
> > Subject: [pure-silver] Re: Tray development and fog
> >
> >
> > > Eric et al, thanks very much for the feedback and
> > > questions.
> > >
> > I don't think glow in the dark timers can be the problem
> > (but you never know). A timer with LED's could well be.
> > Exposed film and paper are sensitized to fogging by the
> > original exposure, that's why I suggested some exposed film
> > as a test. Cover half of it and leave it in the darkroom for
> > a period of time sufficient to cover the normal time between
> > taking it out of the holder and through development. Then
> > process it in a tank.
> > Film and paper are desensitized by most developers and
> > development is stopped in the stop bath in a few seconds.
> > The fixing bath also desensitizes the emulsion. So this is a
> > reasonably good test since the exposure to whatever leak
> > light will actually be longer than film would get in normal
> > processing.
> > There _are_ chemical causes of fog but they are pretty
> > rare in modern darkrooms.
> >
> > ---
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
> >
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