Cross process c41 with black and white chemicals

Discussion in 'Darkroom Developing and Printing' started by chris.ritchie, Feb 3, 2009.

  1. Does anyone have some ballpark times or even qualitative guesses for
    processing color print film with black and white chemicals?

    I'm taking a class and have free (as in beer) access to b/w
    chemicals. Also, I have a few rolls of color (and some slides) laying
    around and would be interested to see what they look like when cross

    It's kind of silly, but I don't plan on using the rolls for anything
    chris.ritchie, Feb 3, 2009
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  2. chris.ritchie

    Doug Jewell Guest

    From memory, when I did C41 in Ilford LC29 at 1:19 I dev'd
    for about 5-1/2 minutes. I got an image that was barely
    scannable and definitely not printable. The B&W chem doesn't
    take out any of the mask, dye couplers etc. So if you have a
    look at a piece of undev'd C41 film, that's pretty much what
    the final dev'd film will look like (slightly clearer but
    not much), with a pale grey image in there.
    You will most definitely not get a nice transparent orange
    masked negative like colour chem gives.
    Does it work? yes but barely. Is it worth doing? not in my

    Now what might be worth trying, but I haven't done...
    Dev in B&W chem. Re-Expose to light, and then redevelop in
    normal chemistry. In theory this should give you a positive
    image but with an orange mask. Scan and adjust out the
    orange mask, (or print with a ciba process and filter out
    the mask) and you should have a usable image but with odd
    colour balance.
    Alternatively use E6 film, Dev in B&W, reexpose, then dev in
    C41. In theory you should get a tranny with an incorrect
    colour/contrast balance.
    I'd be curious if anyone has ever tried these processes.
    Doug Jewell, Feb 4, 2009
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  3. Or, for more fun, google C41 Acceleration.

    erie patsellis, Feb 4, 2009
  4. chris.ritchie

    JCowie Guest

    Hi, wish I'd seen this sooner, Don't Do It. Cross pricessing is running
    C41 in E6 or vice versa. One time I mistakenly ran one sheet of 4x5 b/w
    thru E6 and it came out clear. Never did it withC41 but I'm pretty sure
    you'd get similiar results. The most popular way is C41 in E6. You'll
    proably have to pusk it a couple of stops but it varies from film to
    film. You can get some neat results, high contrast and weird colors.
    Alot offashion photogs used it back in the 80s, I think they liked the
    look the high contrast gave faces. I learned this by working in NYC
    labs, its alot of hit and miss. Good luck.
    JCowie, Mar 5, 2009
  5. Nope.

    Reread what he wrote: he says he as access to black & white chemicals.

    Made From Pears: Pretty good chance that the product is at least
    mostly pears.
    Made With Pears: Pretty good chance that pears will be detectable in
    the product.
    Contains Pears: One pear seed per multiple tons of product.

    (with apologies to Dorothy L. Sayers)
    David Nebenzahl, Mar 5, 2009
  6. chris.ritchie

    K W Hart Guest

    Processing color print film in B&W chemicals will yield a low contrast
    negative with an orange mask, making it fairly difficult to print. For
    developing times, start with times/temps about the same as Tri-X or a bit

    As for processing B&W films in color chemicals, there is one simple problem:
    color negative images are made from dyes, not silver. The dye image is
    formed and then the silver is removed. I have developed B&W film in C-41
    developer and C-41 fixer, leaving out the bleach step, and it works, but the
    chemical activity is fairly low-- longer times and high temps (100F) are

    Go ahead and do your cross-processing fun to get it out of your system. By
    the way, processing slide film in C-41 chemistry is kinda neat.
    K W Hart, Mar 5, 2009
    superevilbrian, Dec 7, 2013
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