Tri-color separation negatives with 35mm

Discussion in 'Alternative Processes' started by Marc Leest, Nov 23, 2009.

  1. Marc Leest

    Marc Leest Member

    Oct 23, 2003
    Hasselt, Bel
    Multi Format
    Dear all,

    I want to make some tri-color gumprints using color separation negatives using ortho film:
    The idea is starting out with 35mm color negative film. Then, using a slide copier, making three positives with unknown filtration on 35mm B+W film for channel separation. These three positives would be used in the enlarger with ortho film to have enlarged negatives.
    Would this workflow feasable ?

    thx for any tips, Marc
    Last edited by a moderator: Nov 23, 2009
  2. henrysamson

    henrysamson Subscriber

    Mar 5, 2007
    Large Format
    Years ago I used to make dye transfer prints. I started out with a 4x5 color negative shot normally. I then made my separations onto Kodak Pan Matrix film using a regular enlarger. Three were made one each through red blue and green filters. So it is somwhat similar to what you are doing. The Matrix film was processed in a tanning developer and they HAD to be developed together to ensure the contrast of the resulting matrices were compatible (to avoid crossed curves). Of course before doing this, tests were done through each filter with a step wedge to determine the exposure for each separation.

    The result was three positives which is your goal. In this case each one was used with a different dye (cyan, magenta, yellow). One important thing to remember is that the easel used to hold the Pan Matrix film had registration pins and the film was punched. This assured alignment throughout the process. So, you may be on the right path. You'll just have to try it.