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My second to last roll of Foma R100 developed as negative (HC-110 dilution H for 12 minutes). I have read about its mysterious anti-halation layer that somehow sits between base and emulsion, instead of on the back, and is neutralized during reversal development (by bleach I'm guessing). Well as it is, it just looks foggy as hell. Not pretty, but I'll see how it scans. I've seen worse. Tmax developed in the same bath for comparison.
No surface bubbling though! So it must be one of the reversal baths causing it (again suspecting the bleach, basically sulphuric acid with potassium permanganate solution). Or just sitting submerged for almost an hour during entire reversal process, versus about 20 minutes when done as negative.