To answer your question, I really don't know, for sure. I would think, though, that since some of the pyro stain (notably ABC and PMK) affects UV transmission that the scanner may not see the stain of the pyro accurately. The reason that I say this is that the scanners of which I am aware all use a discharge type light source (flourescent in nature). Depending on the phosphors which the manufacturer uses, these may have a sizeable UV output. Again, this is only based upon a somewhat limited awareness and not on actual experience.

The one developer that I have encountered that seems to not have the same degree of UV blocking is Sandy King's Pyrocat HD formula. The formula can be found on Ed Buffaloe's site www.unblinkingeye.com. Hope that this helps. Good luck.