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  1. #11

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    Bleach Source

    Thanks so much for your help. I may have a lead on a company in NY that stocks the chemistry and I'll let you know how it goes. I will be in NY next week.

  2. #12

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    This is what they say on the bleach labels for current chemistry:

    BL3.20 bleach (for 20 litres, three parts)

    Part A
    "with no more than 51% acid"
    Sulfuric Acid
    Sodium 3-Nitrobenzene Sulfonate (CAS 127-68-4)
    Water

    Part B
    Ethyl Diglycol
    3-Mercapto-1-Propane Sulfonic Acid (CAS 17636-10-1)
    Potassium Iodide
    Sodium Bromide
    Sodium Iodide
    Quinoxaline Derivative 7 (CAS 17635-21-1)
    Water

    Part C
    Potassium Carbonate
    Sulfonated Trialkylphosphine (CAS 86563-95-3)
    Water


    BL30.2 bleach (for 2 litres, single part)
    Ethyl Diglycol
    Sulfuric Acid
    Sodium 3-Nitrobenzene Sulfonate (CAS 127-68-4)
    Water

    One can only guess why the single part contains significantly smaller number of chemicals. Could it be only because of the labelling requirements?

    Andres

  3. #13
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    The problem is that the nitrobenzene sulfonate level is critical to good imaging, the actual name of the trialkyl phosphine is not specified and the quinoxaline derivative 7 is not exactly specified but there have been posts here about what it is supposed to be.

    It is the catalyst that actually forms the image and is supposed to be the condensation product of Diacetyl with o-Phenylene Diamine. Elsewhere on APUG, the method of making it is not correct and I did post this correction there.

    NDRS, all of those items are specified in the links I gave before, but perhaps with more or less information. You may want to look at those MSDS forms.

    PE

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