i cut more paper just yesteryday, now trying it with some highly expired Kodak Multigrade II RC. it seems much slower than the Ilfospeed 3 my previous images were made with.
also, i (actually!) measured my developer concentration, and played with the process there. my estimations on concentration were way off, a triple strength dilution (1:3 rather than 1:9 as per bottle instructions for Ilford Multigrade) is required for the image reversal to occur. strong-but-close-to-normal concentrations resulted only in an off-color fog when the secondary exposure was applied.
i'll post more results soon.