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  1. #1
    Ian Grant's Avatar
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    Ultra Rapid Monobath

    Potassium Sulphite 20 g
    Antinomy Potassium Tartrate 40 g
    Phenidone 3 g
    Hydroquinone 60 g
    alpha-Thioglycerol 150 ml
    Water to 1 litre

    Will process Kodak Plus-X Reversal in 2.5 seconds @ 48°C and give similar results to the film processed in D19

  2. #2
    David A. Goldfarb's Avatar
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    Thanks for another addition to the collection. I don't think I need that kind of speed, but out of curiosity, I looked up sources for antimony potassium tartrate and alpha-Thioglycerol, and they seem pretty expensive ($73/125 g of antimony potassium tartrate and about $11/g of alpha-Thioglycerol).

    Since I saw it sold by the gram, what is the concentration of alpha-Thioglycerol, and what does it do in the formula?

    "Antinomy"?--Kant wrote about them in the First Critique.
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  3. #3
    Ian Grant's Avatar
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    The reference doesn't state the strength the alpha-Thioglycerol, it's the stabilising agent - the fixing agent.

    I only posted this in response to another article on a High Speed fixer

  4. #4
    David A. Goldfarb's Avatar
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    I see, well, this beats the high speed fixers.
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  5. #5
    Ian Grant's Avatar
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    When I'm next in the UK I'll pay a visit to a lab that may have those two chemicals (we bought everything from a redundant Research Lab AA, ICP etc etc, lab fittings and the complete chemical store !!!!).

    I know I had an Antimony lamp for my AA so must have had some standards etc.

  6. #6
    Photo Engineer's Avatar
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    Note the temperature.

    Many modern fixers will work rapidly at 48C. In fact, you better have a very hard film.

    The Antimony salt probably helps harden here just as Zirconium salts can under some conditions.

    I could probably formulat a fixer that did this at 75 degrees as well, but the price would be high. (well, this one does not come cheap either I guess.)

    Interesting formula Ian.

    PE

  7. #7

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    Will it work at my normal temp of 24C or 20C?
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  8. #8
    David A. Goldfarb's Avatar
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    In my experience, monobaths are pretty temperature sensitive. You can't control contrast by processing time, but changing temperature will change contrast significantly.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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