I'm no longer confused, it's the Sabatier Effect! Solarization is "The exposure necessary to produce true solarization is in the range of 1,000 to 10,000 times that necessary to produce total black in the negative" (From unblingkingeye.com). What I'm talking about is Pseudo-Solarization.
Thank you PE for thee tip on graded paper, I had a try today in the darkroom, and used some old paper that I had, Ilfospeed Grade 4. I also tried Ilford MG, but the Ilfospeed worked a lot better, it produced good results, the MG just turned out more or less as an over-pre-flashed paper.
Anyone tried with film? Im thinking large format in trays might work, but of course, that takes more time.
Yes, I or rather my students have experimented with this. As yet I have not been able to replicate the effects produced by Man Ray, but am working on it. To date we have achieved some quite interesting effects using flash late in the development cycle. Photo Engineer can probably provide better info on this, but my intuition tells me that high a energy short illumination will give a better effect (more Makie lines) than a longer exposure to lower illumination?