FG-7 w/Sodium Sulfite

Discussion in 'Darkroom Developing and Printing' started by Craig Schroeder, Aug 9, 2003.

  1. I just received some sodium sulfite and was going to embark on some
    testing with FG-7. How tunable is the solvent action by dilution?
    Does a little go a long way? I'll find all of this out the hard way
    on my own anyway but was hoping for some insights from others who have
    done some work on this. Recently, I've been seeing comments about
    mushy grain clump edges with the sodium sulfite and I wondered if one
    could moderate the effect by using lower concentrations of it?

    I'm mainly using FP4, HP5 and a little PanF and mostly in medium
    format. A bottle of FG-7 that was given to me to try has been quite
    gratifying and I've liked using it.
    Craig Schroeder, Aug 9, 2003
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  2. Where can one get FG-7? especially in Baltimore? I'm in Israel and
    it's disappeared, but I have a house guest coming in the fall who lives
    in Baltimore.

    TIA, Geoff.
    Geoffrey S. Mendelson, Aug 9, 2003
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  3. I just got another bottle when I ordered my sodium sulfite from
    Freestyle Sales (using their web site). BKA is the US distributor
    source at:


    You might snoop around there for info.... The MSDS info is also on
    the site, showing the components of FG-7.
    Craig Schroeder, Aug 10, 2003
  4. The sodium sulphite can vary between 50 g/l up to 125 g/l in most
    solvent formulae, with 80-100 being the commonest concentrations.
    That's the range you should experiment with.
    Michael Scarpitti, Aug 10, 2003
  5. The sulfite is generally added only for developing high-speed materials.
    Michael Scarpitti, Aug 10, 2003
  6. Craig Schroeder

    Rick Guest

    About 6-7 years ago I only developed film in FG-7 w/ sodium sulfite. I liked
    the fact that the SS was active and cut the developing time nearly in half. I
    thought this was a good combination with 35mm HP5 and TX. One day I thought I
    should try the FG7 without the Sodium Sulfite, just to see how much better the
    sodium sulfite was. I found the non-SS FG7 to give a more balanced look:
    just about as sharp but finer grain. Tonality and curves were about the same.
    I concluded the addition of the Sodium Sulfite did not give better results
    for my needs.

    I should also point out, so you know what I like, that after fooking around
    with FG7 for a couple of years, I finally tried D76 in various forms: stock,
    1:1, 1:3. D76 1:1 was on balance (time spent developeing, cost, grain, film
    speed, accutance, perceived sharpness, contrast, etc.) the best developer and
    subtley better then FG7. The FG7 is nice, though, as its a concentrate.

    Rick, Aug 10, 2003
  7. Craig Schroeder

    John Guest

    Probably some other issue. Film storage or age.


    John - Photographer & Webmaster - http://www.darkroompro.com
    A summation of American society after 9/11:
    Never have so many known so much and yet done so little.
    John, Aug 11, 2003
  8. SS changes the activity of the developer. You probably over-developed the film.
    Michael Scarpitti, Aug 11, 2003
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