Maximum neg density (UV) ?

Discussion in 'Black and White' started by martin_pistor, Jul 25, 2005.

  1. Hi folks,
    after evaluating POP via a greyscale I found xtrahard negs are
    required.
    Any recommendations how to produce negatives with a appr. Dmin-Dmax
    of 2 or even a little more from subjects with normal contrast (wich
    is normally regarded to be 30-100 or log. 1,5-2) meaning I'd need a
    gamma of more then 1.
    Internegative process is known, but I'd like to use my 8x10 negs
    directly.
    Thanks,
    Martin
     
  2. Expose longer, develop longer. See the HD curves for the films. Kodak's T-MAX data sheet is particularly generous with information.

    See the discussions on negative making at http://www.michaelandpaula.com, as they also prefer longer-scale negatives for AZO paper. (You might get hooked on AZO, too.)

    Also see the B&W Photo - Alternative Processes forum here.
     
  3. Consider using a pyrogallol or catechol staining developer which produces higher contrast for POP and graded paper than for VC paper. PMK and Pyrocat HD are popular. You may also use a bleach and redevelop process to add the stain density to unstained negatives that are too low in contrast for POP. Bleach in a rehalogenating ferricyanide-bromide solution as is used for sepia toning. Wash, then redevelop to completion in PMK or Pyrocat in room light. Washing is necessacry, fixing is not.
     

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