Development times??

Discussion in 'Darkroom Developing and Printing' started by Sam G, Jul 16, 2003.

  1. Sam G

    Sam G Guest

    If I start from a certain development time recommended by Kodak for TriX
    with Xtol at 68degrees. Then if my developer is at a higher temperature,
    Kodak's chart shows recommended times for these higher temps. I also have
    the temperature graph that appears in the Massive Dev. Chart (the same chart
    appears with Ilford products) for extrapolating the a given temp/time
    relationship to another temp. Using that graph (obviously a set of linear
    relationships) I find that these times are quite far off from the times in
    the Kodak tables for other temps. (maybe 15-20% off at 75degrees). Can
    anyone explain why that might be so? I would tend to follow Kodak's
    recommendations, but does this mean that, for example, most other developers
    follow a more linear set of time/temp relationships and Xtol doesn't???

    Thanks for any light someone can shed on this matter


    Sam
     
    Sam G, Jul 16, 2003
    #1
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  2. I have found from experience that the Kodak tables, where they exist,
    are more reliable than the Massive Development Chart. In any case, if
    you can do a test development, say of a step wedge, that would be the
    best way to verify which to use.


    Francis A. Miniter
     
    Francis A. Miniter, Jul 16, 2003
    #2
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