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Thread: Chemistry question.

  1. #1

    Join Date
    Nov 1999
    Posts
    763

    Chemistry question.

    Can anyone tell me how stable this formula is. It is part "B" of a Diafine clone formula. From the APUG site.

    Bath #2 -- [3 minutes spinning BTZS tubes]

    Sodium Sulphite 32.5 gms
    Potassium Carbonate 20 gms
    Potassium Bromide 1 gm.
    EDTA 1 gm
    Water to make 500 ml

    I'm interested to know if Potassium Carbonate has a longer or shorter working life in this formula than Sodium Carbonate.

  2. #2

    Join Date
    Sep 2003
    Location
    Portland, OR
    Posts
    743

    Re: Chemistry question.

    There should be no difference in the life of a solution prepared with sodium vs. potassium for carbonates. The thing that will limit the life of this solution is the sulfite. The sulfite will oxidize into sulfate with exposure to oxygen.

  3. #3

    Join Date
    Nov 1999
    Posts
    763

    Re: Chemistry question.

    Thanks for the info Kirk. The actual formula does work very well so I may not worry too much about long life and just replace it on a regular basis.

  4. #4
    Roger Cole's Avatar
    Join Date
    Oct 2010
    Location
    Suburbs of Atlanta
    Posts
    1,553

    Re: Chemistry question.

    Humm, and it's a "Daifine clone?" I know I've kept the same quart jug of Diafine A and B and used them for over a year and a half. Capped off the stuff seemed to last practically forever.

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