Originally Posted by
Mark Sampson
Kodalith was meant to provide two tones only: white and black. Part of this was the dedicated developer but most of it is the film, as you've found. Since the marble shows up as gray your exposure is ok, your contrast is still high because the dark tones (pens) have dropped down to black. So try more exposure to get detail in the dark tones, and a more diluted developer to avoid contrast buildup. I don't know how far you can take this concept but a test or two will tell you. Of course the film sees red as black anyway. The unevenness may (but I'm not sure) be characteristic of trying to tame a high-contrast film down to normal contrast, a difficult exercise at any time. good luck!
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