Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,042   Posts: 1,560,728   Online: 1076
      
Page 5 of 5 FirstFirst 12345
Results 41 to 42 of 42
  1. #41
    Rudeofus's Avatar
    Join Date
    Aug 2009
    Shooter
    Medium Format
    Posts
    1,723
    Images
    10
    Quote Originally Posted by Michael R 1974 View Post
    In a high pH developer like Rodinal which is essentially non-solvent to begin with I can't see how adding 30g/L NaCl would provoke dichroic fog.
    If NaCl in this concentration acts as silver solvent there is a chance it produces dichroic fog. At least the common narrative goes that Microdol introduced 30 g/l NaCl, then, as newer emulsions hit the market, suffered from dichroic fog and that Microdol X was introduced that had an extra agent to prevent this. There is a Kodak/Henn patent for Benzophenone, albeit with other developers (which doesn't say a thing about the real reason Kodak patented this compound).

    Chances are that newer emulsions don't have this problem anyway, so it comes at no surprise that Patrick Robert James never ran into it so far.
    Trying to be the best of whatever I am, even if what I am is no good.

  2. #42
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,348
    Images
    148
    It was only Kodak's US emulsions that changed and suffered badly from Dichroic fog with Dk-20 and Microdol. In the UK the Kodak Ltd, Harrow, new films were fine and they continued selling Microdol for longer before switching to Microdol-x.

    Ian

Page 5 of 5 FirstFirst 12345


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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