Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,735   Posts: 1,515,459   Online: 1123
      
Results 1 to 3 of 3
  1. #1

    Join Date
    Sep 2002
    Location
    Willamette Valley, Oregon
    Shooter
    Medium Format
    Posts
    3,684

    A. Thio At 1:49 - Strength and Speed

    I've finished a short series of fixer tests. I've tested only
    Arista 5x7 grade 2, RC. The solution volume of 125ml included
    2.5ml of P's Formulary ammonium thiosulfate and nothing else.
    The pre-wet but unexposed sheet was given 2 minutes of
    constant agitation. Three washes, 1, 2, and 3 minutes,
    each of 125ml distilled, followed.

    I could see no trace of stain using the ST-1 test.
    Completely clean and in two minutes; A. Thio. At 1:49. Dan

  2. #2
    Reinhold's Avatar
    Join Date
    Aug 2003
    Location
    Washougal, Washington
    Shooter
    Multi Format
    Posts
    681
    Images
    14
    Dan;

    Are you planning to test the capacity of the fixer? A 1+49 dilution has a lot less "active ingredient" than Ilford's recommended 1+4 dilution for rapid print processing.

    It would be interesting to use that same 125 ml and continue to process 5x7 sheets while plotting the elevating silver content, perhaps by using Kodak silver test papers. This would give us some idea of the square inch/per ml capacity of fixer.

  3. #3

    Join Date
    Sep 2002
    Location
    Willamette Valley, Oregon
    Shooter
    Medium Format
    Posts
    3,684
    Quote Originally Posted by Reinhold
    Dan;
    Are you planning to test the capacity of the fixer? A
    1+49 dilution has a lot less "active ingredient" than Ilford's
    recommended 1+4 dilution for rapid print processing.

    It would be interesting to use that same 125 ml and continue
    to process 5x7 sheets while plotting the elevating silver content,
    perhaps by using Kodak silver test papers. This would give us
    some idea of the square inch/per ml capacity of fixer.
    My capacity of a liter of concentrate at 1:49 is twice that of
    Ilford's at 1:9 dilution which is twice that of Ilford's at 1:4. At
    my 1:49 dilution a liter of concentrate will fix well within
    Ilford's archival limit, 200 8x10s. That is based upon
    a silver content of 1.6 grams/meter square.

    At Ilford's 1:9 that same liter will fix 100 and at 1:4, 50. The
    higher concentrations likely will fix less archivaly or not at all.
    Ilford's maximum silver content per liter working strength, .5
    gram, is based upon an average mix of prints. My standard
    is based upon an unexposed sheet of print paper.

    According to my standard 5ml of concentrate in 250 ml of
    solution, 1:49 dilution, will fix ONE 8x10. AND do it in
    TWO, 2, MINUTES.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin