I would like to try with film, how did your (or the students) tests turn out cliveh?
We were doing it with 35mm film cut into 3 strips at random and developed in seperate tanks. The development time was 12.5 minutes at 20C. The first tank we took the spiral out after 8 minutes and let off a small flash at about 4 feet away, the second after 10 minutes and the third after 11. It looked like 8 and 10 were good, with nice Mackie lines. However, it would be nice to learn from others about how to replecate the techniques of Man Ray. By the way the original shots were high key taken in a studio.