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  1. #11

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    Quote Originally Posted by Rudeofus View Post
    It's not only about pH, it's also about buffer strength! DTPA is a buffer at pH 8.5, if if we use less Borax in order to compensate for omission of DTPA, we create a much weaklier buffered developer.
    hmm ... may be. but I think that amount of DTPA relatively low for change buffer capacity.

  2. #12
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    Quote Originally Posted by Relayer View Post
    hmm ... may be. but I think that amount of DTPA relatively low for change buffer capacity.
    That dev isn't exactly loaded with Borax either ...
    Trying to be the best of whatever I am, even if what I am is no good.

  3. #13

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    The Australian MSDS documents often contain more detail. For what it's worth, here is an extract from it:

    2. COMPOSITION/INFORMATION ON INGREDIENTS:
    NAME
    CAS No.: EINECS Nr.:


    2,2'-OXYBISETHANOL (Diethylene glycol)
    111-46-6 203-872-2
    5-10 %

    HYDROQUINONE
    123-31-9 204-617-8
    1-5 %

    1-PHENYL-4-METHYL-4-HYDROXYMETHYL-3-PYRAZOLIDONE (Dimezone-S)
    13047-13-7 235-920-3
    0-1 %

    DIETHYLENETRIAMINE PENTAACETIC ACID NA5
    67-43-6 200-652-8
    1-5 %

    SODIUM TETRABORATE
    1330-43-4 215-540-4
    1-5 %

    BORIC ACID
    10043-35-3 233-139-2
    1-5 %

    WATER
    30-60 %

    POTASSIUM SULPHITE
    10117-38-1
    30-60 %


    DENSITY/SPECIFIC GRAVITY (g/ml): 1.31 Temperature (°C): 20

    pH-VALUE, CONC. SOLUTION: 8.7

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