Re: Pyro stain and UV transmission


John Rudiak (wizard@laplaza.org)
Fri, 22 Jan 1999 17:44:53 -0700


Hi Liam!

Did you bleach with a dichromate/halide bleach? If so the extra density
is from chromium intensification. I use this on occasion to transform
negatives developed for silver into platinum/albumen negatives, using
pyro as the redeveloper.

John

Liam Lawless wrote:

> HI everyone, I have heard that PMK is excellent for platinum
> printing, but Hutchings says only with the right film, i.e. one with
> "low inherent base fog" (because of the stain's relative opacity to
> UV), and suggests FP4+ as a good choice. In view of this fact, maybe
> Tri-X isn't the best choice for alt., but read on...



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