Can I use 20% ferric oxalate for platinum/palladium?

Discussion in 'Alternative Processes' started by Erik L, Dec 9, 2011.

  1. Erik L

    Erik L Subscriber

    Messages:
    641
    Joined:
    May 9, 2007
    Location:
    Grand Juncti
    Shooter:
    4x5 Format
    Hi folks,
    As the title suggests, can I use my kallitype ferric oxalate which is 20% with platinum/palladium which I normally use at 27%? Thanks for any help.
    Regards
    Erik
     
  2. clay

    clay Subscriber

    Messages:
    1,125
    Joined:
    Nov 21, 2002
    Location:
    Asheville, N
    Shooter:
    Multi Format
    In theory, you should be able to use 135% of the normal drop count of ferric (27/20 ~ 135%) to the standard metal salt drop count and deal with the additional volume of water in the coating solution by drying the coated paper a little longer. So if you normally use 10 FO and 10 Pd metal solution, use 13-14 FO and 10 Pd metal solution. The water is just a carrier to get the chemicals to saturate the paper fibers, and it should be mostly dry once the paper reaches ambient humidity.

    On the other hand, ferric is ridiculously cheap compared to the metal salt, so why not just buy some more ferric oxalate and avoid the dropper count math?
     
  3. Erik L

    Erik L Subscriber

    Messages:
    641
    Joined:
    May 9, 2007
    Location:
    Grand Juncti
    Shooter:
    4x5 Format
    Thanks Clay, it's not an economic decision but rather a time crunch decision to get this done this weekend and into the mail. All I have at the moment is a kallitype mix. I appreciate the math you provided. Thanks
    regards
    eRik