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  1. #41
    David A. Goldfarb's Avatar
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    Thanks for reminding me. I've just ordered a copy before it gets scarce. I didn't really think of monobath developing as anything but a novelty before, but now it's looking like a practical thing to think about.
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  2. #42
    Ian Grant's Avatar
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    David, I'll scan and send you Geoffrey Crawley's 1972 BJP article when I'm next in the UK, it refers to the Haist book as well as other publications.

    A PyrocatHD type monobath could be very useful for LF sheet processing, tray processing with no need to worry too much about time or temperature

    Ian

  3. #43
    David A. Goldfarb's Avatar
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    Thanks, Ian!
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  4. #44

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    I read about the develop-in-the-coffee-mug technique a while ago, and I've been curious about it since. I asked about it on (I think) another forum quite some time ago, and was told that while it would likely work, getting consistent results might be a problem as the film coiled inside the cassette might not get evenly exposed to the solution, and this might be more of an issue for 36-exp. cassettes than 12 or 24.

    I'd be curious to hear from those here who have tried it - is this a concern in practice?

    Also, to clarify, I take it monobaths are generally used for box speed or slower - is it possible to use a monobath for pushing, say, 1-3 stops (it strikes me the fixer action would be harder to guage when trying to push)?
    i can't wait to take a picture of my thumb with this beautiful camera.

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  5. #45
    Ian Grant's Avatar
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    I'd never try the coffee-mug method as the film can easily be scratched. You can't use a monobath for push-processing because the balance between the rate of development and fixing can't be altered, and is less temperature dependant than normal B&W development. Of course you could alter the formula to give you increase development.

    My own work with monobaths in the 70's showed you could get excellent results by tweaking a monobath formulae to get the best out of a particular emulsion.

    Ian

  6. #46
    David A. Goldfarb's Avatar
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    I just mixed up a batch of FX 6a, originally from the BJP but included in Haist's _Monobath Manual_, and I'll be darned--the stuff works. [This is the same as Formula #45, G. W. Crawley's monobath, in Anchell's _Darkroom Cookbook_, and I just realized it's in posts #18 and 27 above].

    I tested with two sheets of Efke PL100 in about 100ml of solution, one at a time.

    First test I figured no way is this going to give me the box speed, so I'll rate it at EI 50 and compensate on the generous side for reciprocity. Processed 6 minutes (agitating first 30 sec, then 5 sec for every minute), and I turned on the lights fully prepared to find a blank sheet in the tray, and I realized I was way overexposed.

    Next sheet I tried at EI 100 and stricter reciprocity correction, and the neg looks dense, somewhat overdeveloped, less overexposed. According to Haist, increasing the hypo should bring down the contrast, and then I can fine tune the speed.

    Anyway, this looks like a very viable thing. Part of the reason I use Acufine as a deep tank developer is for convenience (when I'm trying to be more serious, I use PMK or ABC usually), as well as the extra speed, and I could see a tuned and tested monobath replacing that, when I don't need the speed.
    Last edited by David A. Goldfarb; 02-26-2008 at 08:30 PM. Click to view previous post history.
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  7. #47
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    Just FYI, D76 can act as a monobath for pure chloride emulsions.

    Please don't ask how I know. I think it is obvious. Anyhow, it is the sulfite in the D76 that does it.

    PE

  8. #48
    David A. Goldfarb's Avatar
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    Interesting. Straight D-76 with no added hypo?
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  9. #49
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    Yes. The sulfite is a strong solvent and can wipe out AgCl images in the right emulsion. It does not work with all of them, but does a real job on others.

    PE

  10. #50

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    This is a bit OT I know, but is this why high sulfite developers don't work for the RA4 reversal process? As they use a chloride emulsion?



 

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