How do I do B/W direct reversal?

Discussion in 'B&W: Film, Paper, Chemistry' started by Loose Gravel, Mar 24, 2005.

  1. Loose Gravel

    Loose Gravel Member

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    I'd like to make some negatives from my negatives. These would be contacts for masking purposes. Need to be continuous tone. Ortho film would be nice. 5x7 or 8x10 film. What is the best way to accomplish this? I know that Kodak's Direct duping film is gone. Is there a good way to do this directly, or should I use an inter-positive?

    Thanks all.
     
  2. dancqu

    dancqu Member

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    At www.unblinkingeye.com there is a good article on the direct
    negative method. The exact reference I do not recall. Peruse.

    I think the method interesting for whole negative contrast
    control. May someday buy some Azo. Dan
     
  3. Loose Gravel

    Loose Gravel Member

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    Dan, thanks for the reference.

    Azo would not fix these problems.
     
  4. hortense

    hortense Member

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    For masks the last 4-years, I've used Arista 200. It cost is low and I've had no problems with it. For those that wish to have some light, I suggest using Freestyle's Arista APHS Ortho Lith using a ruby bulb for a safelight.
     
  5. Donald Qualls

    Donald Qualls Member

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    Seems to me I've read that both the Arista Ortho Lith (which is a relabeled Ilford product, I think) and Maco Genius Printing Film are capable of continuous tone when developed in common developers like Dektol; both are similar products to Kodalith, though I'm not sure of the safelight capabilities of Maco Genius.
     
  6. GeorgesGiralt

    GeorgesGiralt Member

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    Hi !
    As direct dupe (AKA SO-015 ) is gone, you have 2 otpions :
    1) go to internegative route : make a positive on film and repeat to get the awaited negative. (you have 2 possibilities to adjust contrast and density, this way)
    2) expose one film, and treat it in a B&W reversal chemical process. Simpler in theory but I wonder if it will be shorter in time or difficulty. But as your new negative is first generation copy, it may be less defect prone than the second generation copy you will get with option #1
    Time to lock yourself in the darkroom ;-)
     
  7. Loose Gravel

    Loose Gravel Member

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    George, I think you are right. All the reversal processes I've seen are pretty nasty chemicals. I think there is a third possibility, make a digital mask on acetate, but I don't have a printer.

    Thanks, LG
     
  8. dancqu

    dancqu Member

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    Liam Lawless recommends APH not APHS. That
    S is for silver down the drain.
    To read the article by Mr. Buffaloe, Search Google for,
    "less is more" aph . He also has the article at his site unblink. Dan