Page 8 of 8 FirstFirst ... 678
Results 71 to 74 of 74

Thread: Ordorless Fixer - Ordorless ?

  1. #71
    Vlad Soare's Avatar
    Join Date
    Jun 2008
    Location
    Bucharest, Romania
    Posts
    466

    Re: Ordorless Fixer - Ordorless ?

    Here's a formula for TF-2 Alkaline Fixer from The Film Developing Cookbook. It looks a lot like Vlad's formula.

    Water 750ml
    Sodium Thiosulfate 250 g
    Sodium Sulfite anhydrous 15 g
    Sodium Metaborate 10 g
    Water to make 1 L
    Yup. It looks similar. I use bicarbonate because it's extremely cheap and it's available in very pure form from any supermarket (it's so cheap and clean, that I also use it as a source of sodium carbonate for developers ). I guess any mild base, like sodium metaborate, or borax, would work just as well, but I just find bicarbonate more convenient.

    The thread is two years old, and at that time I was just starting to mix my own fixer and wasn't yet sure about the formula. I used 240g of crystallized thiosulfate because I had found that amount recommended in books and on the internet. The formula called for 160g anhydrous or 240g pentahydrate. So I took the 240 for granted. However, the pentahydrate equivalent of 160g anhydrous is not 240g, but 250g. One mole of thiosulfate is 158g anhydrous or 248g pentahydrate.
    So I'm now using 250g of thiosulfate, not 240g as I said two years ago.
    In practice there's probably no difference, anyway.

    Whether 15g of sulfite would be enough, I don't know. 30g seems to work for me, but who knows, maybe I could get away with less. I don't know how to calculate the minimum amount of sulfite required to preserve a liter of fixer for a long enough time. We need a chemist's help. Ole?

  2. #72

    Join Date
    Aug 2008
    Location
    Southland, New Zealand
    Posts
    2,082

    Re: Ordorless Fixer - Ordorless ?

    Ok, I see. I can do OF-1 or Vlads formula. Stupid question, but are theese used undiluted for film? Does one use the fixer for a while and then discard, and how long is a while, or are they replenished?

  3. #73
    Vlad Soare's Avatar
    Join Date
    Jun 2008
    Location
    Bucharest, Romania
    Posts
    466

    Re: Ordorless Fixer - Ordorless ?

    Use undiluted, for either film or paper.
    With films, I test it from time to time and discard it when the clearing time becomes too long. I find that sometimes it's still good after three or four months. It exhausts from use faster than it oxidizes.
    With FB papers, I use the two bath fixing method. I discard the first bath after approximately twenty 8x10" prints, replace it with the second, then mix a new second bath.

  4. #74

    Join Date
    Aug 2008
    Location
    Southland, New Zealand
    Posts
    2,082

    Re: Ordorless Fixer - Ordorless ?

    Thanks, that sounds sensible.

Similar Threads

  1. Homebrew Hardening Fixer?
    By rknewcomb in forum Darkroom: Film, Processing & Printing
    Replies: 3
    Last Post: 14-Nov-2008, 07:19
  2. Choice of fixer on print color
    By Michael Graves in forum Darkroom: Film, Processing & Printing
    Replies: 1
    Last Post: 17-Jun-2007, 14:55
  3. fixer differences
    By Jack_5762 in forum Darkroom: Film, Processing & Printing
    Replies: 2
    Last Post: 27-Aug-2005, 14:51
  4. "Rapid fixer" v.s. plain old "fixer"
    By Calamity Jane in forum Darkroom: Film, Processing & Printing
    Replies: 10
    Last Post: 4-Mar-2005, 06:11
  5. TF-4 Rapid Fixer, an alkaline fixer
    By William Marderness in forum Darkroom: Film, Processing & Printing
    Replies: 3
    Last Post: 11-Jan-2000, 22:10

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •