Lachlan Young
Member
No, that was one of them. The other was regular reversal.
Having found the paper that was given at the 2006 ICIS conference that Ron attended and discussed the outcomes of on here, it's actually effectively a negative working emulsion that when given extended thermal development undergoes direct reversal. The two patents referred to in the paper are here and here and go into more detail about the inventors' conjectures as to the processes at work.
There's also a paper from the same conference on Provia 400x and on Fuji's 'Image Intelligence' software. Like many of these papers given at imaging conferences, they tend to give hints rather than disclose directly.