rapid, non-hardening alkaline fixer, questions on formulae

Discussion in 'Darkroom Developing and Printing' started by Shakti V. via PhotoKB.com, Oct 8, 2006.

  1. I've researched on two other fixer formula because F-24 is a slow fixer. I
    want a rapid fixer.

    Here are the formulae:

    Neutral rapid fixer
    ammonium thiosulfate (60% solution) 200ml
    sodium sulfite 15g
    sodium metabisulfite 5g
    water to make 1 liter

    + However, I've read that ammonium in fixer is not for open trays because of
    the ammonium fumes.

    ~

    So, here is another formula, the TF-2 Alkaline Sodium Thiosulfate Fixer

    Distilled water 1000 ml
    Sodium Thiosulfate 250 g
    Sodium Sulfite (anhy) 15 g
    Sodium Metaborate 10 g

    TF-2 will wash out of negative and print materials more rapidly than will an
    acid fixer. In jackspcs.com, it was not indicated how long PRINTS should be
    fixed in this specific fixer (but it was indicated it should be washed for 30
    minutes).

    My questions are:

    1. The resource for the neutral rapid fixer formula didn't indicate the
    length of time for fixing FB prints. How long should FB prints be fixed in
    neutral rapid fixer?

    2. Which fixer (neutral rapid fixer, or TF-2 alkaline) would you recommend?

    3. If TF-2, how many minutes does it take for FB prints to be fixed in this
    fixer? Someone told me it takes 10 minutes to fix prints with TF-2, but an
    online source stated it fixes films (3-5 minutes) and prints (no. of minutes
    not stated) faster than usual fixers; so I thought, if it fixes faster, then
    it should not be 10 minutes like a regular fixer. How long, really, does TF-
    2 take to fix FB prints?

    4. I assume that since ther is no alum in either formula, then these fixers
    are non-hardening fixers. Is my assumption right?

    5. Is there a rapid, non-hardening alkaline fixer that uses sodium
    thiosulphate as hypo (instead of ammonium thiosulphate)? If you know of such
    a fixer, please post the formula here.

    6. Would you know other rapid fixer formula/e that would work with FB prints?
    If you do, and if you recommend that fixer, please post the formula here.

    I have so many questions and the possibilities roll in my head, because I am
    so eager to learn chemical mixing. Bear with me as I am only beginning to
    learn mixing my own chemicals. I really hope you could help me. Thanks.
     
    Shakti V. via PhotoKB.com, Oct 8, 2006
    #1
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  2. Shakti V. via PhotoKB.com

    dan.c.quinn Guest

    Home brew as it often goes by. I took it up a few years
    ago. A pointer: where you see an opportunity mix less than
    full formula amounts. Do some testing. For fixer and the washing
    out there of, purchase a small amount of sodium sulfide and
    silver nitrate. If interested I'll post exact test procedures for
    the two tests performed with those two chemicals. The
    first is the ST-1 test for residual silver left in the
    emulsion. The second is the HT-2 test for
    residual thiosulfate.

    As an alternative processing method I'll mention my single-tray
    one-shot processing of prints. Solution chemistry is used
    more dilute than usual and only once. The method is
    similar to rotary, tube, processing. Dan
     
    dan.c.quinn, Oct 9, 2006
    #2
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