Switch to English Language Passer en langue franšaise Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 74,544   Posts: 1,646,144   Online: 810
      
Page 26 of 28 FirstFirst ... 16202122232425262728 LastLast
Results 251 to 260 of 275
  1. #251

    Join Date
    May 2011
    Location
    MA, USA
    Shooter
    Large Format
    Posts
    1,362
    Images
    19
    Quote Originally Posted by 37th Exposure View Post
    In the days of hardening hypo fixers and before HCA Kodak literature for its Brownie and other rollfilms stated that if running water is not available, five changes of water five minutes each with agitation is sufficient. A 1930 Ilford manual stated 7 to 8 changes, 5 mimutes each with agitation, if water is short. Leica manual 1930s suggested 8 changes, 2 minutes each, vigorous agitation, if water is short. ( if you own Niagara Falls, all give the usual 20-30 minute running water spiel). Water is always short these days, and if not don't try to make it that way. Anyway, do these archaic methods hold true today if hardening fix is used? With nonhardening fixers would these be more surefire than the surprisingly fast Ilford method of today of only three changes?
    And i totally forgot to respond to the OP - 10 water changes are all you need if you use a hypoclearing agent. In a nut shell.
    CatLABS of JP
    Darkroom resources and service

    www.catlabs.info | https://www.facebook.com/CatLABS.of.JP | www.jobo-usa.com

  2. #252

    Join Date
    Feb 2010
    Location
    The Land of the Yellow Box
    Shooter
    35mm
    Posts
    129
    Quote Originally Posted by CatLABS View Post
    And i totally forgot to respond to the OP - 10 water changes are all you need if you use a hypoclearing agent. In a nut shell.
    Thanks. May I ask how to proceed? Like how many minutes, etc.

  3. #253
    David A. Goldfarb's Avatar
    Join Date
    Sep 2002
    Location
    Honolulu, Hawai'i
    Shooter
    Large Format
    Posts
    17,687
    Images
    20
    Threads merged.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  4. #254
    fotch's Avatar
    Join Date
    Mar 2005
    Location
    SE WI- USA
    Shooter
    Multi Format
    Posts
    4,473
    Quote Originally Posted by David A. Goldfarb View Post
    Threads merged.
    thank you
    Items for sale or trade at www.Camera35.com

  5. #255

    Join Date
    May 2011
    Location
    MA, USA
    Shooter
    Large Format
    Posts
    1,362
    Images
    19
    Quote Originally Posted by 37th Exposure View Post
    Thanks. May I ask how to proceed? Like how many minutes, etc.
    You just need to fill, and dump.
    If you are doing roll film, you can flip the reels over so the top goes to the bottom half way through.
    CatLABS of JP
    Darkroom resources and service

    www.catlabs.info | https://www.facebook.com/CatLABS.of.JP | www.jobo-usa.com

  6. #256
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,354
    Images
    65
    I repeat! Use a retained Silver and retained Hypo test kit to test your wash conditions.

    PE

  7. #257
    ozphoto's Avatar
    Join Date
    Apr 2006
    Location
    Bangkok, Thailand
    Shooter
    Multi Format
    Posts
    1,193
    Images
    1
    Quote Originally Posted by Photo Engineer View Post
    I repeat! Use a retained Silver and retained Hypo test kit to test your wash conditions.

    PE

    PE,

    Maybe I'm a bit slow but who sells these kits? I tried a Google search and it didn't bring up anything I could match as being even remotely close to what you're suggesting. I've been meaning to actually invest in a Retained Silver Kit, but so far, drawn a blank. (Although TH does have it's drawbacks and nuances - so that could explain a lot!!)

  8. #258
    Philippe-Georges's Avatar
    Join Date
    Apr 2005
    Location
    Flanders Fields
    Shooter
    Multi Format
    Posts
    722
    Quote Originally Posted by Photo Engineer View Post
    I repeat! Use a retained Silver and retained Hypo test kit to test your wash conditions.

    PE
    Dear PE,

    Just to be sure we are talking about the same:

    - retained silver test = Kodak Silver Residual Test => 1+9 KRST in plain water: a drop on the clear end of a B&W film, when the colour turns out yellowish then fix again…

    - retained hypo test = 1/1000 Potassium manganate (KMnO4) in plain water: a few drops in the last bit of washing water dripping out of the emulsion, when the colour turns out brownish then wash again…

    Thanks for commenting.
    Last edited by Philippe-Georges; 03-09-2014 at 03:44 AM. Click to view previous post history. Reason: correcting the sloppy grammar
    "...If you can not stand the rustle of the leafs, then do not go in to the woods..."
    (freely translated quote by Guido Gezelle)

    PS: English is only my third language, please do forgive me my sloppy grammar...

  9. #259
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,354
    Images
    65
    The retained Silver test is Sodium Sulfide in water, and the retained Hypo test is Acetic Acid + Silver Nitrate. The first forms a black color on the paper or film and the second forms a yellow color.

    I think that Freestyle, the Formulary and Fotoimpex all have these as standard stock items. Kodak and others have published the formulas for both along with color charts to give the user a hint as to his "quality".

    PE

  10. #260

    Join Date
    Jun 2012
    Location
    UK
    Shooter
    Multi Format
    Posts
    2,269
    Images
    3
    theformulae for both tests are given here http://unblinkingeye.com/Articles/Ar.../archival.html



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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