Whats the difference between RA4 and C41?

Discussion in 'Darkroom Developing and Printing' started by A Lee, Aug 11, 2003.

  1. A Lee

    A Lee Guest

    Never having processed colour negs/prints,I think this is a bit of a
    numptie question, but is there any difference between RA4 and C41?
    Is it C41 for the film and RA4 for the print?

    I'm asking because I've just bought some C41 for developing a few films
    (I dont want prints, they are being scanned for the web), but I use RA4
    chems every day at work, so would be able to get them free. (under a
    brand name,so there are no recommended processing details).

    A Lee, Aug 11, 2003
    1. Advertisements

  2. Hi Alan,

    C-41 is the chemistry for developing color film. All color film
    currently produced can be (and should be unless you are experimenting)
    developed with C-41 developer and bleach-fix (or bleach and fixer used
    separately). RA-4 is the chemistry for developing color paper. There
    are differences in the chemistry. RA-4 typically uses CD-3 (a Kodak
    developer) as its main developing agent. C-41 uses CD-4 (also a Kodak
    developer). The generic formulas have been published several times in
    Photo Techniques USA [if I remember correctly Jan-Feb 2002 was one time
    or was it Nov-Dec 2001?]. A variant of the formulas was published in
    this newsgroup by Bill Laut, under the subject heading: "Homebrew RA-4
    and C-41". I use Bill's formulations to compound my color chemistry and
    an very happy with the results.

    Francis A. Miniter
    Francis A. Miniter, Aug 11, 2003
    1. Advertisements

  3. A Lee

    John Vizcarrondo

    Dec 25, 2014
    Likes Received:
    I know this post is really out dated, but can anyone tell me where I can get Bill's formulation for color chemistry. I am just really curious on how that would work out. thank you.
    John Vizcarrondo, Dec 25, 2014
  4. A Lee


    Jan 19, 2015
    Likes Received:
    His formulas aren't on the forums here anymore, but here's a link where you can find his formulas on Claudio Bonavolta's website. http://www.bonavolta.ch/hobby/en/photo/c41_ra4_chemicals.htm

    Good luck! If anything, the Darkroom Cookbook is an excellent resource on mixing your own raw chemicals into photo chemicals. There's also the Film Developing Cookbook if I remember right.
    TNT, Jan 19, 2015
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.