Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,747   Posts: 1,515,685   Online: 943
      
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 26

Thread: C41 Recipe

  1. #11
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,870
    Images
    65
    Well, Chloride is a halide, and there is some interaction. Since color neg is carefully balanced, I would avoid Chloride ion if at all possible. Kodak quit using HAHCl just about when I joined the company for just that reason. In fact, there was none on the shelves when I came there. Everything was HAS and so I did not get to run the experiment comparing the two. I just accepted the "current wisdom" on the subject.

    Maybe I should not have, but that was the accepted situation back then.

    PE

  2. #12
    Athiril's Avatar
    Join Date
    Feb 2009
    Location
    Melbourne, Vic, Australia
    Shooter
    Medium Format
    Posts
    2,494
    Images
    28
    Quote Originally Posted by Photo Engineer View Post
    Well, Chloride is a halide, and there is some interaction. Since color neg is carefully balanced, I would avoid Chloride ion if at all possible. Kodak quit using HAHCl just about when I joined the company for just that reason. In fact, there was none on the shelves when I came there. Everything was HAS and so I did not get to run the experiment comparing the two. I just accepted the "current wisdom" on the subject.

    Maybe I should not have, but that was the accepted situation back then.

    PE
    I just suspect it would be very low, due to it's weak solvent and restraining action in B&W dev's normally needs to be significantly higher to be useful. I do have access to a densitometer which I calibrate before every use, and a Imacon 949, if I get some time, I can plot some colour curves, and do some very high scans to examine grain and sharpness differences using varying NaCl amounts added to C-41 developer.

  3. #13
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,870
    Images
    65
    Well, I would rather be right than wrong.

    PE

  4. #14

    Join Date
    Sep 2011
    Location
    Chattanooga TN
    Shooter
    35mm
    Posts
    496
    Images
    10
    The recipe linked in #10 above is the one I use, with very good results.

  5. #15

    Join Date
    Jun 2012
    Location
    Sydney, Australia
    Shooter
    35mm
    Posts
    75
    Thanks for the response.
    Is the "potash" in this recipe Potassium Hydroxide?
    Also, I was a bit confused about the product Calgon. Can you clarify that?
    Cheers,
    Peter
    Last edited by HumbleP; 11-14-2012 at 11:38 PM. Click to view previous post history.

  6. #16
    Athiril's Avatar
    Join Date
    Feb 2009
    Location
    Melbourne, Vic, Australia
    Shooter
    Medium Format
    Posts
    2,494
    Images
    28
    Quote Originally Posted by HumbleP View Post
    Thanks for the response.
    Is the "potash" in this recipe Potassium Hydroxide?
    Also, I was a bit confused about the product Calgon. Can you clarify that?
    Cheers,
    Peter
    Potassium Carbonate iirc.

  7. #17

    Join Date
    Jul 2010
    Location
    Southern USA
    Shooter
    Multi Format
    Posts
    3,769
    Calgon is a calcium sequestering agent used when mixing with tap water. Its chemical name is sodium hexametaphosphate.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  8. #18

    Join Date
    Jun 2012
    Location
    Sydney, Australia
    Shooter
    35mm
    Posts
    75
    Just wondering about the A905 in the recipe you recommended Athiril. It's a wetting agent right?
    Couldn't find much info on that or where to source. Can a product like Forma Flo Wetting Agent
    be used instead?

  9. #19

    Join Date
    Aug 2006
    Shooter
    35mm
    Posts
    152
    The A905 is a wetting agent of the former east German company „ ORWO“.
    The contemporary equivalent (biocides added) should be “Calbe F905”
    http://www.calbe-chemie.com/uploads/...ttel%20(D).pdf

    Actually you may omit this agent; I introduced it when I switched to development without prewash step.
    It looks like there is no real need for it, just a liter on my shelves is waiting to get used before deteroation…

    Regards, Stefan

  10. #20

    Join Date
    Jun 2012
    Location
    Sydney, Australia
    Shooter
    35mm
    Posts
    75
    Thanks everyone for the responses. It's hugely helpful.
    I've almost managed to source everything I need, all except for the Formalin in the stabalizer.
    I'm wondering if I can leave the formalin out or should I just buy something like Kodak Flex III Stab & rep?
    Thanks

Page 2 of 3 FirstFirst 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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