pyrocat HD formula

Discussion in 'B&W: Film, Paper, Chemistry' started by philsweeney, Jan 27, 2009.

  1. philsweeney

    philsweeney Member

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    I don't know where I originally collected Sandy King's pyrocat HD formula. After rebuilding my darkroom and organizing my formula sheets I find conflicting data: I have 0.2g potasium bromide recorded and see elsewhere 0.1g. I usually multiplied the formula by 5 to measure the potasium bromide more easily at 1.0 gram.

    Not sure what is official formula - though I would not change methods for consistancy, I am guessing with more pot. bromide the development would be slowed down?
     
  2. sanking

    sanking Member

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    Phil,

    The formula calls for 2 grams of bromide per liter of Stock A, but you could use only one gram, or omit the bromide entirely if you like. If you eliminated it entirely you would get a tad more efective film speed, which is good, but a tad more B+F. Those are the trade offs.

    Sandy King