Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,269   Posts: 1,534,379   Online: 872
      
Page 2 of 2 FirstFirst 12
Results 11 to 14 of 14
  1. #11
    dmr
    dmr is offline
    dmr's Avatar
    Join Date
    Sep 2005
    Shooter
    35mm
    Posts
    493
    Quote Originally Posted by Donald Qualls
    Kodachrome has no dye couplers, dyes and couplers are provided in the three (!) color development stages, along with reversal exposures.
    On this, I'm mostly just curious, not that I want to try it or anything, but can you or anybody maybe give pointers to a good explanation on how Kodachrome is processed. I keep hearing veiled references to adding dyes and couplers, and multiple re-exposures with colored light, but I've never found anything authoritative and concise. TIA.

  2. #12
    Ed Sukach's Avatar
    Join Date
    Nov 2002
    Location
    Ipswich, Massachusetts, USA
    Shooter
    Medium Format
    Posts
    4,520
    Images
    26
    Quote Originally Posted by dmr
    On this, I'm mostly just curious, not that I want to try it or anything, but can you or anybody maybe give pointers to a good explanation on how Kodachrome is processed. I keep hearing veiled references to adding dyes and couplers, and multiple re-exposures with colored light, but I've never found anything authoritative and concise. TIA.
    Camera and Darkroom had a definitive article on Kodachrome Processing - at least the K14 process. Many steps and solutions - and processing at various temperatures in the process. Most of the chemistry could only be obtained in LARGE bulk packaging ~ 500 pounds or so.

    I've been as busy as I ever have been in recent memory lately. I'll try to find time to transcribe and post the recipe.
    Carpe erratum!!

    Ed Sukach, FFP.

  3. #13
    dmr
    dmr is offline
    dmr's Avatar
    Join Date
    Sep 2005
    Shooter
    35mm
    Posts
    493
    Quote Originally Posted by Ed Sukach
    I'll try to find time to transcribe and post the recipe.
    Thanks, Ed. I would appreciate that.

  4. #14
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,972
    Images
    65
    For those interested, here is a thumbnail of Kodachrome processing:

    Rem-Jet removal
    Rinse
    First developer
    Wash
    Red Reexposure through the base
    Cyan color developer
    Wash
    Blue Reexposure through the emulsion side
    Yellow color developer
    Wash
    Chemical fog
    Magenta color developer
    Wash
    Bleach
    Wash
    Fix
    Wash
    Dry

    It takes over 1 hour IIRC, and the developers are very high pH and quite unstable. The process has to run 24/7 for all practical purposes to stay in control. And, since the couplers are in the developers, you can watch them turn cyan, yellow and magenta as they aerially oxidize.

    It can be done by hand in a small sink line dip and dunk. That is how small samples of Kodachrome are processed during the research and development cycle.

    FYI, in the 80s Kodak trade trialed a 400 speed Kodachrome that was beautiful, but no one was interested. So, it died before it was born. The last Kodak ads for Kodachrome were in the early 90s, as the market share had shrunk by then to the point where it was already dying before any d***tal came along.

    PE

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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