Response to Temperature vs. time

Thanks, Pete. You're right, the grain increasing effect does not always occur (as I also stated). In the "Focal Encyclopedia of Photography" (Stroebel, Zakia) it is mentioned that it happens with older film emulsions, due to the swelling of the emulsion at high temperatures (Pg. 208). In Rivhard J. Henry's "Controls in Black and White Photography" an experiment is discussed, where Kodak Tri-X developed in D-76 1+1 is developed at high temperatures and where grain and acutance show a great increase at temperatures over 78 Farheneit. In the same experiment, Panatomic-X and Royal-X Pan show no significant changes when deleloped at a high temperature (pg 221 and Table 7-2). As for the sympathetic technique described by Barry Thornton in his "Edge of Darkness" book, it is stated that using Diluted Perceptol (for higher acutance due to accentuated edge effects) at a high temperature results to a slight grain magnification (pg. 90)...

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