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  1. #21
    smieglitz's Avatar
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    Oct 2002
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    Thanks for the clarification Sandy.

    Joe

  2. #22

    Join Date
    Sep 2003
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    I'm not a chemist and it took me a couple of hours to digest everything that was discussed here. I made following tests today with the results:

    1. I added sodium bicarbonate into my hypo;
    2. I made test strips with
    a) 1 layer of sensitizer,
    b) 2 layers of sens.,
    c) 1 layer of sensitizer with citric acid added,
    d) ditto as c) but 2 layers
    all were exposed for the same length of time, although c) and d) might've received more exposure because citric acid as a contrasting agent usually requires longer exposure.
    3. I fixed for 1 minute and in that time no bleaching was visible
    4. Results:
    a) poor
    b) very good, beautiful colour but not perfect contrast
    c) poor but with better contrast than a)
    d) very good contrast but awful colour (dark mustard); in this case the fixer didn't change the colour almost at all

    Different papers may react differently, which is a matter of further experimentation.

    Thanks everyone for the very interesting, motivating, and helpful discussion!

    Kate
    PS: Happy New Year!

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