Sodium Sulfite Solution questions (for Polaroid 55)

Discussion in 'Darkroom Developing and Printing' started by Stephan Goldstein, Mar 19, 2006.

  1. I'd like to start playing around with Type 55 P/N film. From reading I know
    the negatives should be cleared (per Polaroid) in an 18% solution of Sodium
    Sulfite. What I don't know is the storage life of said solution, or how to tell
    when it's dead. Or is it immortal?

    Thanks all!

    Stephan Goldstein, Mar 19, 2006
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  2. Its tough to answer this because the life of the solution
    depends on the concentration of the solution and how much
    air its exposed to. 18% is a fairly strong solution, about
    what is found in stock Kodak Hypo Clearing Agent. Sodium
    sulfite will slowly change to Sodium sulfate by absorption
    of Oxygen from the air. In a closed container it will last
    for a couple of months, maybe longer. In a tray for several
    Sodium sulfate will do no harm but I don't know if it
    functions as a clearing agent for Polaroid.
    Richard Knoppow, Mar 19, 2006
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  3. Note that different emulsions of Polaroid call for different compositions of
    that clearing bath. You might look in Ansel Adams' book, "Polaroid Land
    Photography", Appendix C, for different formulae for different types.
    Jean-David Beyer, Mar 19, 2006
  4. Stephan Goldstein

    Frank Earl Guest

    You may want to try plain tap water. It has worked for me just fine on
    type 665 pos-neg film. Tap water here is about pH 8.5. The reason I
    went with plain tap water is that I had a hard time getting 180 grams of
    sodium sulfite to dissolve in a liter of water.

    I put the neg in a tray and ran water over it until all the gunk
    dissolved away. Then soaked the negative in regular clearing solution.
    Then Photo-flo and dry.
    Frank Earl, Mar 24, 2006
  5. Wow! I wonder what is in your water. Sodium Sulfite is very soluble in water
    if it is not too cold. If it is at freezing point (but not frozen) you
    should be able to dissolve about 125.4 grams per litre. If it is 80 C, you
    should be able to dissolve 283 grams per litre.
    Jean-David Beyer, Mar 24, 2006
  6. You can just use Hypo Clearing Agent, or Perma-Wash -- they're sodium
    (or ammonium) sulfite. I can't remember the dilution for clearing
    Polaroid film, off the top of my head; I know I have it written down
    somewhere in an old darkroom notebook, but I also know that someone
    else here should be able to supply it a lot faster than I could find
    the book and look it up. :)
    Thor Lancelot Simon, Mar 24, 2006
  7. Stephan Goldstein

    Frank Earl Guest

    Calcium carbonate and a lot of stuff I really don't want to know about :>).
    Frank Earl, Mar 31, 2006
  8. Stephan Goldstein

    Mike King Guest

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