Pyrocat HD + JandC Pro 100 + Pt/Pd

Discussion in 'Alternative Processes' started by John_Brewer, Sep 3, 2006.

  1. John_Brewer

    John_Brewer Member

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    Can anyone give me a ballpark figure for J and C 100 pro sheet film souped in Pyrocat HD in a Jobo CPE2? The negs will be used for palladium printing with Na2 for contrast control and maybe some gum.

    What dilutions of Pyrocat HD do people prefer for alt negs? I've seen 1:1:100, 2:2:100 and 2:1:100. What happens with the different dilutions?

    Thanks

    John.
     
  2. mark

    mark Member

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    No help here but I will be looking at this thread really close.
     
  3. sanking

    sanking Restricted Access

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    I am not sure I can help you. I tested some ASA 100 film from China distributed by JandC and if this is the same film I have some data. However, if it is a different film I have not used it.

    Sandy
     
  4. gbock

    gbock Member

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    John,

    I've used 2:2:100 for 11 minutes at 23°C with some success. I rate the film at EI 50. This is for pt/pd printing, BTW.

    Gerhard
     
  5. John_Brewer

    John_Brewer Member

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    Sandy, it could well be the same film, the label sealing the film bag has Chinese writing on it. I would be very interested in seeing your data.

    Gerhard, thanks for your info.

    John.
     
  6. Alex Hawley

    Alex Hawley Member

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    John, ditto on rating it at 50 asa. My experience with this film is very similar to Gerhard's. Rating it at 100 doesn't allow enough shadow detail and the negatives are thin for contact printing.
     
  7. sanking

    sanking Restricted Access

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    John,

    If it is the same film I would recommend about eight minutes of development at 72F, using the 2:2:100 dilution of Pyrocat-HD. This should give you a DR of about 1.75, which would be about right for palladium with a bit of Na2.

    This is based on rotary processing and is for scenes of normal contrast.

    Sandy
     
  8. Scott Peters

    Scott Peters Member

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    Sandy, sometimes I see 1:1:100 and others 2:2:100 for pyro hd. Why the divergence in dilutions among recommendations?
     
  9. Scott Peters

    Scott Peters Member

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    Oh, forgot to add, in response to John's initial question, what happens in general with diff dilutions?
     
  10. User Removed

    User Removed Guest

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    I shoot the JandC Pro 100 at ASA 50. I develop it in Pyrocat HD at 2-2-100 for between 6-15 minutes, normal about 10 minutes. Im using tubes on a roto base and temp is about 50 degrees.
     
  11. Alex Hawley

    Alex Hawley Member

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    The 1:1:100 is for general silver printing (enlargements) while 2:2:100 is for contact printing.
     
  12. John_Brewer

    John_Brewer Member

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    Thanks for the input everyone.

    John.
     
  13. sanking

    sanking Restricted Access

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    Yes, that is the basic reasoning. Contact priting with AZO and alternative processes requires negatives of much greater CI than silver printing. I wanted to normalize time of development and found by trial and error that this could be done for the two types of processes by changing dilution.

    In other words, a 1:1:100 dilution at 10 minutes will give a similar CI as 2:2:100 at about 6 minutes.

    Use the dilution that gives the most convenient time for your conditions.


    Sandy
     
    Last edited by a moderator: Sep 6, 2006