About the Development Time Charts

The development times provided below are the result of extensive tests done under carefully controlled conditions designed for accuracy and consistency and to avoid technical flaws such as reciprocity failure, lens flare, and so on. See Appendix F for a description of the process used to define these data and Appendix G for commentary by Iris Davis.

Note: For the technically minded, my test negatives were consistently printed at the minimum time that it took to render the film base plus fog density as maximum black on grade 2 paper.The negatives were hand-processed and printed with a diffusion enlarger and machine-print processed.

We began this process by asking a number of basic questions.

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