Re: Fortepan

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 08:46:00 2004