Easy-measure Fixer

Easy-measure Fixer

  1. nworth

    nworth Subscriber

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    nworth submitted a new resource:

    Easy-measure Fixer - Easy-measure Fixer

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    Last edited by a moderator: Feb 6, 2016 at 5:32 PM
  2. Bruce Osgood

    Bruce Osgood Membership Council

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    Ammonium thiosulfate (60%) 3/4 cup (200 ml)
    Water to make 33 fl. oz (1 l)
    Sodium metabisulfite 1 tsp (12.6 g)
    Sodium sulfite (anh) 1 tsp (8.8 g)


    I like the idea of premixing the dry and holding in film canisters.

    I'll be using Arm & Hammer wash aid (Sodium sulfite - mono). Do you know if the increase from anh to mono is 15% (8.8 x 1.1765 = 10.4)? Any feelings for capacities with Fiber Base papers?

    Thanks,
     
  3. juan

    juan Subscriber

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    Bruce, the Arm and Hammer is sodium carbonate, isn't it?
    juan
     
  4. Bruce Osgood

    Bruce Osgood Membership Council

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    IT SURE IS!!! IKES, I've done it again.... Thank you Juan.
     
  5. FilmIs4Ever

    FilmIs4Ever Restricted Access

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    While I am not trying to interfere with the idea of inexactness here (this is why I like customary units so much), let me point out that it is unfortunate that you have picked units (cups and teaspoons) that have at least four commonly-used units each depending on system or the size of the cup, although the metric equivalent for cups does seem to indicate the U.S. 8-fl.-ounce definition of a cup.

    Are you using U.S. teaspoons or the metricized versions that are making rounds? It'd be best to give the metric equivalent of the size of your teaspoon just so as not to introduce variables.

    There's also differently sized UK, Australian, and Canadian teaspoons, some 1/3 of a tablespoon, some 1/4, so this unit is particularly messy.

    Also, as a final nitpick (sorry!) the Liter is closer to 34 U.S. fl. oz. than 33 (33.8 and change)
     
  6. Photo Engineer

    Photo Engineer Subscriber

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    I'm afraid that Karl is right about all of the variants in these kitchen measurements. This has been my objection since the very start.

    It is especially bad when one considers the fact that different forms of the same compound such as powder and crystal vary by 20% in weight when measured by volume.

    This can be a calamity with developers but not very harmful with fixers unless one does not test for hypo and silver retention to get the right archival wash conditions.

    Then, it beomes a calamity again!

    PE
     
  7. Tom Hoskinson

    Tom Hoskinson Member

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    That looks a lot like Ryuji Suzuki's recipe:

    Neutral Rapid Fixer

    Ammonium thiosulfate 120g
    (or 60% solution 200 ml)
    sodium sulfite 15g
    sodium metabisulfite 5g
    water to make 1.0 liter
    target pH 7.0 plus/minus 0.5

    This fixer gives rapid fixing and rapid washing, same benefit as what's claimed for alkaline fixers, but with minimum of swelling.
    Suzuki
     
  8. Photo Engineer

    Photo Engineer Subscriber

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    The original near-neutral pH fixes have been known for years. Such fixes have been patented by Kodak and others for a variety of benefits. The optimum pH range is 6.2 - 6.7 as disclosed in the literature, but some move it to pH 7.0 for one reason or another.

    PE