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  1. #1

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    Sodium thiosulfate

    Simple question I hope...

    Can Sodium thiosulfate by used by itself as a fixer for pyro negatives (tri-x 320 sheets)? I have the crystals but have no idea how to mix it.

    edward@crgdirectories.com

  2. #2
    Ian Grant's Avatar
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    It can 240gm per litre of water. But it has no buffering capacity so isn't good for re-use.

    Ian

  3. #3

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    Thanks Ian. Is that the working solution?

  4. #4
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    Quote Originally Posted by eshotwell View Post
    Thanks Ian. Is that the working solution?
    Ian, I have Sodium sulfite in a large bag. Can i use that for some good?

  5. #5
    Ian Grant's Avatar
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    Yes you could about 15 gms, but usually acetic acid or Metabisulphite is added as well. Have a look in e the Formulae/Recent Chems sectiotion here or on Unblinkingeye.

    Ian

  6. #6

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    Quote Originally Posted by Ian Grant View Post
    Yes you could about 15 gms, but usually acetic acid or Metabisulphite is added as well...
    Isn't acetic acid or sodium metabisulfite added in case you want to use a hardener as well? If that's true, sodium sulfite is the only thing required to make it reusable.

  7. #7

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    Use It Straight

    Quote Originally Posted by eshotwell View Post
    Simple question I hope... Can Sodium thiosulfate by used
    by itself as a fixer for pyro negatives (tri-x 320 sheets)?
    I have the crystals but have no idea how to mix it.
    edward@crgdirectories.com
    That's all I use, film or paper, sodium thiosulfate unadulterated.
    I mix fresh for the session. I do know that it can be bottled for
    at least a few days storage but don't bother because there
    is nothing to it to have fresh at time of use.

    There two of the sodiums, anhydrous and the penta hydrate.
    Full strength, which I never use, calls for 240 to 250 grams
    of the penta or 150 to 160 grams of the anhydrous. You'll
    know which one you've got by a chilling of the solution
    on dissolving the penta.

    For a roll of 120 I use 16 grams of the anhydrous. That
    would be 25 grams of the penta. Slow but fresh each
    roll and when done, down the drain. Dan

  8. #8

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    dancqu,is penta the crystals that look like rice grains , anhydrous is dried powder?

    Mike

  9. #9
    McFortner's Avatar
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    Penta is the large crystals. Like Dan, it's all I use right now. About 2/3 of a cup per 2 liters of water. My average fix time is about 8 minutes (depending on clip test). Sure, it's not as fast as other fixers, but it's more friendly to the environment and my septic tank.

    Michael

  10. #10

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    Anhydrous

    Quote Originally Posted by mike c View Post
    dancqu,is penta the crystals that look like rice
    grains, anhydrous is dried powder? Mike
    Anhydrous finely granular, penta coarsely.
    The penta is about 1/3 water and endothermic.

    With prints I use sodium thiosulfate very dilute
    one-shot. Minimum solution volumes help maintain
    good chemical mileage and reasonable times.

    Works well when single tray processing; great where
    short of space. A BIG plus with prints and likely film
    is the very low levels of silver in the fix;
    'archival' levels. Dan

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