From: Carl Weese (cweese@earthlink.net)
Date: 08/23/02-01:24:12 PM Z
Victor,
Thanks. I'm glad to see a confirmation of the Gainer method from PT. I'd
assumed he was correct but it's always nice to see a procedure confirmed by
another worker.---Carl
-- web site with picture galleries and workshop information at: http://home.earthlink.net/~cweese/ ---------- >From: Victor Loverro <victor.loverro@verizon.net> >To: alt-photo-process-l@sask.usask.ca >Subject: Re: negative intensification >Date: Fri, Aug 23, 2002, 11:22 AM > > 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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