From: Steve Shapiro (sgshiya@redshift.com)
Date: 06/07/02-08:23:20 PM Z
First of all, I would return the exposed filmfor analysis to the distributor
who can pass it to the manufacturer. They may give you tips on how to read
the box to determine the run.
Second, the film speed for daylight use is actually 125 iso; and that is
what Berkard Kirkirgard (soory if the spelling is off) recommends as he
finances the manufacturer I would go with his calculations. I use it, when
I can afford it, rated at 100 iso; and since I develop by inspection I can
simply do as I please.
Finally, the idea of washing off the anti-halation dye is an important step
in processing large format film. Two minutes to saturate the film in water
and wash off the dye requires only that you add 30 seconds to your favorite
developer/development time. I found HC 110 Solution B is the best middle
ground developer if you are trying a new film for the first time. If you
jump right to the complex developers like PMK, you are asking for
experimentation. Quick solution?: Learn to develop by inspection or get
versed in stand developers.
S. Shapiro
----- Original Message -----
From: "Manuel Gomes Teixeira" <PunctumStudios@netc.pt>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Friday, June 07, 2002 8:39 AM
Subject: Re: BPF 200 problem
> Richard,
>
>
> Thank you very much indeed for your reply.
> Has I've said in my post I've alrady refixed the film in tray but didn't
> help at all. The back of the film remained exactely in the same condition
as
> before. If we look carefully to the back of the film by reflection we can
> notice a really thick coating with some kind of texture, invisible by
> transmitted light (perhaps the anti halation coating) that doesn't come
off
> with extended fixing and washing in a tray.
>
> Is there any other agent who could dissolve this annoying stuff ?
>
> Thanks again
>
> Manuel Gomes Teixeira
> Punctum Studios Ltd
> Aveiro- Portugal
> EU
>
> > From: Richard Sullivan <richsul@earthlink.net>
> > Reply-To: alt-photo-process-l@sask.usask.ca
> > Date: Fri, 07 Jun 2002 08:55:06 -0600
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: Re: BPF 200 problem
> >
> >
> > Manual,
> >
> > This is a common problem with BPF and Expert tanks. It is the anti
halation
> > coating not coming off.
> >
> > I believe it was Carl Weese who first figured out this system.
> >
> > When loading the film think of it as forming the letter "C" Make sure
that
> > the opening of the "C" faces outwards from the center of the drum. This
> > allows the fluid to circulate behind the film better. Dunno why but it
> > seems to work most of the time.
> >
> > You might also try loading the film into a drum with water in it. messy
but
> > it works.
> >
> > Or what I've done is to develop, fix in the drum. Opne the drum and fix
> > further in a tray -- this will remove any halation layer and then post
> > stain and wash in the tray.
> >
> > For some reason the anti-halation layer on BPF is hard to get off.
> >
> > --Dick Sullivan
> >
> >
> >
> > At 02:22 AM 6/7/2002 +0100, you wrote:
> >> Hi all,
> >>
> >>
> >> Today I've printed Pt/PL with a 5x7 BPF 200 negative developed in
Pyrocat
> >> HD.
> >> For the first time I noticed a strange phenomena. In the sky zone of
the
> >> print a kind of blotches appeared that were not visible at all in the
> >> negative with transmitted light. Meanwhile I discovered that looking
to
> >> the film from its back side making it reflecting a fluorescent light
I
> >> could see funny colour areas identical to the ones we can see in the
cars
> >> windshields when viewed through polaroid glasses.
> >> We can conclude that some of those irregular zones absorb more UV that
> >> others making those areas of different density to appear in the
print.
> >> Could be a problem with the antihalation coating ?
> >> As I said before those areas are absolutely invisible through
transmitted
> >> light.
> >> Those sheets were developed in a Expert tank. I tried to refix and
washing
> >> them again but the problem remained.
> >>
> >> I've looked for other BPF sheets from other batches, developed in Rollo
Pyro
> >> and I could notice the same phenomena.When the affected area is not
sky
> >> nothing wrong appears to be wrong with the print.
> >>
> >> Perhaps some other BPF users could have something to say about this
matter.
> >>
> >> Thanks
> >>
> >>
> >> Manuel Gomes Teixeira
> >> Punctum Studios Ltd
> >> Aveiro- Portugal
> >> EU
> >
> >
> >
> >
> >
> > _______________________________________________________
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