From: Victor Loverro (victor.loverro@verizon.net)
Date: 08/23/02-10:35:00 AM Z
And for negatives originally developed in Pyro, Mr. Gainer adds: "Bleaching
and redevelooping a negative originally developed in PMK produced a print on
grade 2 paper that looks as if it had been printed from a normal negative on
grade 4."
----- Original Message -----
From: "Victor Loverro" <victor.loverro@verizon.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, August 23, 2002 9:22 AM
Subject: Re: negative intensification
> The method I have been using is the one described by Patrick Gainer in
an
> excellent article in the Mar/April 2000 Photo Techniques titled "More
> Pyrotechnics." It is a bleach and redevelopment in PMK process. I have
> used it on negatives that were initially developed in non-pyro developers
> that were almost too thin for silver printing. I have not done
alt-process
> printing, but I use the negatives for POP printing on the Centennial paper
> which requires a fairly contrasty negative. The negatives also print much
> better on regular silver paper.
> For the bleach:
> 2 tsp. potassium ferricyanide
> 1 tsp. potassium bromide
> add to 1 pint of water.
> Bleach the negative until there is no more black silver image. This may
> be done in normal room light. Wash thoroughly before redevelopment. It
is
> important to expose the negative to bright light after bleaching and
before
> redevelopment. Then develop in PMK. I use the normal times recommended
for
> whatever film I am using. There is no need to fix after and no need to
> return to developer. If more contrast/density is needed, the process can
be
> repeated. One caution: make sure the negative you use is thoroughly
fixed
> and thouroghly cleared of any fixer. Any residual fixer may cause
streaking
> in the redeveloped negative.
>
>
> ----- Original Message -----
> From: "Carl Weese" <cweese@earthlink.net>
> To: "altphotolist" <alt-photo-process-l@sask.usask.ca>
> Sent: Friday, August 23, 2002 9:09 AM
> Subject: negative intensification
>
>
> > Many alternate processes require negatives with more contrast than
> "normal".
> > Some films can easily reach the needed level of contrast simply by
> extending
> > development, others do not respond as well. Intensification to increase
> > contrast is another way to get long scale negatives. I'm interested to
> know
> > if anyone on the list uses this approach routinely, or as a normal
> > corrective procedure. If so, what methods have proved most useful?
> Selenium
> > looks like the simplest procedure, but there are others and I'm curious
> > about results.---Carl
> > --
> > web site with picture galleries
> > and workshop information at:
> >
> > http://home.earthlink.net/~cweese/
> >
>
>
>
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