TF-4 Question & Lith print

Discussion in 'B&W: Film, Paper, Chemistry' started by Guillaume Zuili, Dec 28, 2012.

  1. Guillaume Zuili

    Guillaume Zuili Member

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    Hi,

    Lith prints almost always bleach in the regular fix, and sometime I wish I could keep these delicate highlights I feel in the tray (without having to compensate with burning).
    So...
    What TF-4 does to a lith print ? Does it bleach or not, or less than acid fix ?
    Did anyone try ?

    Thanks.
    G.
     
  2. michael_r

    michael_r Subscriber

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    I think it is more complicated than pH. TF-5 apparently doesn't bleach the image and it is slightly acidic (near neutral pH). Hopefully PE will respond with some more detail.
     
  3. Guillaume Zuili

    Guillaume Zuili Member

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    Thanks Michael. TF4 & 5 I guess are quite different. Will try the 5.
     
  4. michael_r

    michael_r Subscriber

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    Let us know how it goes. I believe PE formulated TF-5, or at least had something to do with it.
     
  5. Guillaume Zuili

    Guillaume Zuili Member

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  6. Dan Henderson

    Dan Henderson Member

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    I have used TF4 and 5 on lith prints. Never really noticed that one bleached the highlights more or less than the other. As far as I know, it is a fact of life that fixer bleaches highlights. After several years lith printing I am still impressed at how a print lightens in the fixer under the safelight. So I just try to factor that into my exposure time to end up with the highlight level I want. For me, if I can just barely see a little color in the lightest portion of the fixed print, the dry down will give me just enough more.
     
  7. Photo Engineer

    Photo Engineer Subscriber

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    Bill Troop designed TF-4, and he and I did the work on TF-5.

    From reports I have, neither of these bleaches an image of any sort to any great extent. However, excessive times will cause bleaching of images. All fixers bleach silver given enough time.

    PE
     
  8. Guillaume Zuili

    Guillaume Zuili Member

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    I have to do the same Dan but was hoping of a silver bullet :smile:
    Thanks PE.
    I will do a test anyway to see the differences with my regular fix.
    Thanks everybody.

    G.