bleach bypass RA4 with blix

Discussion in 'Color: Film, Paper, and Chemistry' started by danzyc, Jan 29, 2009.

  1. danzyc

    danzyc Member

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    hello people do you ever tried a bleach bypass with room temperature kit (blix)??

    how works???

    also do have you ever tried partially bleach bypass( blix 50%) and then fix??

    thanks
     
  2. MikeSeb

    MikeSeb Member

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    What is the purpose of a "bleach bypass"?
     
  3. Ian Grant

    Ian Grant Subscriber

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    Astronomers used it to dev colour film, normal colour dev then no bleach bath just fix then wash, bleach in a re-halogenation bleach, expose to light & reprocess, this particular method was also called looping. It could be done a few times and amplified the images, the final stage was normal C41 bleach & fix or blix.

    I've done it with chromogenic processing of B&W paper.

    Ian
     
  4. danzyc

    danzyc Member

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    the finality is to achieve a dense black ,high contrast,desatured look and a a beautifull effect of enhancing the texture...i used it in motion picture film....
     
  5. Anon Ymous

    Anon Ymous Member

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    Am I missing something here? If blix is used how can you do bleach bypass? I mean isn't blix supposed to be bleach and fix in the same solution?
     
  6. FilmIs4Ever

    FilmIs4Ever Restricted Access

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    Check this out. . .

    http://www.cinematography.com/index.php?showtopic=36214

    Looks like it is far more complicated than simple dilution or percentage, though I don't think anything more than bleach needs to be altered. Silver is generated by just the regular color development action, so you don't need to alter developer or fix. Unevenness definitely can be a problem though, and you'll definitely need separate bleach and fixation steps. . .
     
  7. sehrgut

    sehrgut Member

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    I know I'm necro-ing this thread, but the OP's question was never really answered. Partial bypass is indeed possible, and if the only bleach you have is a blix, then you can still do a partial bleach bypass. Bleach bypass is also reversible, so you can keep removing silver while you experiment until you have a silver density you like.

    Given the original question, I'm assuming you have blix and straight fix, but no straight bleach. I'd try using no blix first to see how you like it. If that produces too dense of negs for you, blix it for 10% of the time, then refix. Repeat until you have a process you like, then do it with negs that actually matter.

    Though if you're going to all this trouble, you may want to get a separate bleach, since there's no reason to use blix except convenience, and this is decidedly NOT convenient. Still, I like the look, and it's worth working for! :smile:
     
  8. Rudeofus

    Rudeofus Subscriber

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    It is actually quite simple to do bleach bypass with a kit that supplies BLIX: these kits supply two bottles for mixing BLIX, and if you look carefully you will see that one looks deep red like Ammonium Ferric EDTA while the other one looks slight yellowish like Ammonium Thiosulfate. Just leave out the deep red liquid part and you should have a fixer.

    If you want to use your own fixer, make sure it is neutral, PhotoEngineer gave us recommended pH between 6.3 and 6.7 on multiple occasions.