Ultra Rapid Monobath

Ultra Rapid Monobath

  1. Ian Grant

    Ian Grant Subscriber

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    Ian Grant submitted a new resource:

    Ultra Rapid Monobath - Ultra Rapid Monobath

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    Last edited by a moderator: Feb 6, 2016 at 5:31 PM
  2. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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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.
     
  3. Ian Grant

    Ian Grant Subscriber

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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 :D
     
  4. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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    I see, well, this beats the high speed fixers.
     
  5. Ian Grant

    Ian Grant Subscriber

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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. Photo Engineer

    Photo Engineer Subscriber

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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. 2F/2F

    2F/2F Member

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    Will it work at my normal temp of 24C or 20C?
     
  8. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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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.