Over on Mike Johnston's blog the subject of Ansel Adams' famous "Black Sun, Tungsten Hills, California" came up today--


This is an example of true solarization--where the extreme overexposure of the sun on film causes a decrease in density on the negative rather than an increase in density. In an interview I found on the web, Adams is quoted as saying that one Isopan neg he processed from this scene in D-23 did not show this solarization effect, while the negative that prints as "The Black Sun," was processed in a compensating pyrocatechin formula, which I would take to be Windisch's Extreme Compensating developer.

I noticed that the only image I have that shows this effect was shot on TXT and processed in ABC pyro--


So now I'm wondering, is the propensity for solarization a pyro effect? Anyone want to hazard a guess as to why that might or might not be? Anyone have any other examples of solarization like this, caused by overexposure of the sun in the frame, with developer information?