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  1. #1

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    What's the sodium carbonate doing in the bleach?

    I'm into making my own bleach (potassium ferricyanide + potassium bromide) for indirect toning. I have seen recipes that include sodium carbonate (e.g., Photographers' Formulary recipe). What function does the sodium carbonate serve?
    Bob Walberg

    The fix is in!

  2. #2

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    Shanghai, China
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    Quote Originally Posted by walbergb View Post
    I'm into making my own bleach (potassium ferricyanide + potassium bromide) for indirect toning. I have seen recipes that include sodium carbonate (e.g., Photographers' Formulary recipe). What function does the sodium carbonate serve?
    Just a guess here...pH buffer?

  3. #3

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    Jul 2012
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    Perhaps it has something to do with contrast?

    http://www.largeformatphotography.info/twobath/

  4. #4

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    That's what I thought too, a pH buffer.



 

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