Re: Fortepan

Susan,

The color of the stain you get with PMK varies a lot with film and
water so there is nothing unusual about your experience.

I definitely recommend against putting the negatives back into the
used Pyro as the last step. Any stain added to the film at this point
is B+F stain that does not enhance the printing quality of the
negative in any way.

And my personal opinion is that PMK is far from an ideal developer
for alternative processes. With most of the alternative processes we
need negatives with a lot of contrast and the only way to get that
with PMK is with very long development times or by using the
developer at high temperatures. And long development times can result
in an increase in B+F stain from oxidation.

Sandy

>Hello Sandy, thank you for the very informative article!
>I hope you can put me on the right path with an answer to my question... I
>use POP with negatives developed with
>Pyro- Hutchins formula by the Formulary. My nega have always been of a
>yellowish-brown hue. I never get green
>stain. Am I doing something wrong?
>Also; do you reccomend not placing the negs back into
>used Pyro as the last step?
>PS. I only wash my negs for 5 mins. due to water restrictions (esp. in the
>summer). Thanks, Susan
>www.susanhuber.com
>----- Original Message -----
>From: "Sandy King" <sanking@CLEMSON.EDU>
>To: <alt-photo-process-l@sask.usask.ca>
>Sent: Thursday, March 04, 2004 6:26 AM
>Subject: Re: Fortepan
>
>
>> John,
>>
>> The stain produced by Pyro developers is a UV blocker and results in
>> more contrast because it is greater in the highlights than the
>> shadows.
>>
>> This is explained in some detail on p. 3 of my article on Pyro
>> developers. Go to http://unblinkingeye.com/Articles/PCat/pcat.html
>> and for the question of the impact of stain with different processes,
>> which is really quite complicated, see page 3.
>>
>>
>>
>> Sandy
>>
>>
>>
>>
>>
>>
>> >Sandy,
>> >
>> >I was responding to the email below. Where you say using ABC does not
>> >produce a lot of stain. I am confused by your paragraph. You essentially
>say
>> >that by having more film stain you get more contrast...? I was just
>seeking
>> >clarification because I have never used Pyro in conjunction with UV
>> >processes.
>> >
>> >Regards,
>> >
>> >John
>> >
>> >
>> >> John wrote:
>> >>
>> >> Hello,
>> >>
>> >> I am bit confused with this line of questioning. Are you saying that
>> >> PyrocatHD has less of a staining effect, thus it exposes faster under
>UV
>> >> processes?
>> >>
>> >> Regards,
>> >>
>> >> John
>> >>
>> >>
>> >>
>> >>> I am confused by the question. I don't remember anything like that
>> >>> being mentioned in my exchange with Cor.
>> >>>
>> >>>
>> >>> Sandy
>> >>>
>> >>>> Cor
>> >>>>
>> >>>>
>> >>>> Yes, I have been testing with Pyrocat-HD, and also with ABC Pyro.
>ABC
>> >>>> gives much larger grain than Pyrocat-HD but develops more contrast
>> >>>> for blue sensitive processes like AZO and graded papers. On the
>other
>> >>>> hand ABC does not produce a lot of image stain so for UV processes
>> >>>> you get more contrast with Pyrocat.
>> >>>>
>> >>>> Sandy
>>
>>
Received on Sat Mar 6 11:44:23 2004