From: Carl Weese (cweese@earthlink.net)
Date: 09/01/01-06:25:19 AM Z
Manuel,
Those results are puzzling. Bergger BPF 200 in regular PMK pyro acts as you
describe--high fog and low contrast--and so I don't recommend that
combination for Pt/Pd work. In my tests several years ago, the film
responded quite differently to ABC+ (rollo) pyro with low fog and all the
contrast you could ask for. It is possible that the film has changed, but
more likely there's something wrong with the batch of pyro you are using.
Harold Leban, who devised the formula, says that it should be aged for
several days before use, but it has a limited storage life after
mixing.---Carl
--
web site with picture galleries
and workshop information at:
http://home.earthlink.net/~cweese/
----------
>From: Manuel Gomes Teixeira <PunctumStudios@netc.pt>
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: POP choices
>Date: Fri, Aug 31, 2001, 9:36 PM
>
> Hi Carl,
>
>
> This topic of pyro developed negatives to use both with POP silver and Pt/Pd
> is very interesting to me because I've concentrated myself on this two
> methods for contact printing and discussions about this matter are
> practically absent.
>
> I use BPF with Rollo Pyro from Lotus View Camera in Expert drums and the
> results I got until this moment are not entirely satisfactory.
> With normal developing times the contrast is simply not enough for POP and
> I tried to give longer times but overall B+F+Stain increased to a level
> that the exposure needed to UV is to long with the related problems.
> I've tried as you recommend in "The New Platinum Print" : "strengthening
> the developer and cut the developing time" but I didn't solve the above
> described problem.
>
> Perhaps I'm missing something concerning pyro development.
>
>
> greetings
>
> Manuel Gomes Teixeira
>
> Punctum Studios
> Portugal
> EU
>
>
>> From: Carl Weese <cweese@earthlink.net>
>> Organization: Carl Weese Associates
>> Reply-To: cweese@earthlink.net
>> Date: Thu, 30 Aug 2001 11:37:26 -0400
>> To: Alt-photo-process <alt-photo-process-l@sask.usask.ca>
>> Subject: POP choices
>>
>> James,
>>
>> Assuming you will have access to a darkroom for film development (4x5
>> film in trays doesn't take much space): FP4+ in PMK pyro will give you
>> negatives you can print in POP silver, and then later print in Pt/Pd or
>> on standard variable contrast silver paper. Pretty good combination. It
>> gives high acutance if that's what you're after. As for obtaining it in
>> Japan, just take a couple dry packaged kits from ArtCraft Chemical with
>> you. Each will make 50 liters of working solution which is enough for an
>> enormous number of 4x5's. The mixed stock solutions have excellent shelf
>> life. Tri-X/PMK is another good pair. TMX and HP5 are more trouble
>> getting enough contrast for POP processes. Of course observe proper
>> precautions for handling pyro which is more toxic than more ordinary
>> developers.---Carl
>> --
>> Web Site with picture galleries and workshop information
>> http://home.earthlink.net/~cweese/index.html
>
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