As an experiment I shot a roll of Ilford XP2 Super, and cross processed it\nin E6 slide chemistry, to get B&W slides. I shot the roll at EI200.\nAt 200, they look underexposed - quite dark and muddy. I'd estimate under by\nabout 1 stop, so if I try this again I'll shoot at 100 (In retrospect, I\nshould have bracketed or shot part of the roll at 200, part at 100 and part\nat 50, slap).\nThe slides also look quite low in contrast. This could be because of being\nunderexposed, although it could also be a characteristic of the fact that\nthey are designed to be shot at 400 and C41 processed. I suspect shooting at\n100 or 50 will lower contrast even more, so perhaps I should be shooting at\n200 or 400, and giving them a 1 or 2 stop push in the first development.\nSince the aim is black & white slides, the higher contrast gained by push\nprocessing would probably look more attractive. I also considered the\npossibility of using regular B&W chem for the first developer instead of E6\nchem, this would require considerable experimentation for times.\nFinally, the dyes ilford use aren't black, so what I actually have are\nbluish-green tinted images.\nConclusion - it was an interesting experiment, but at for a roll of 24 a\nrather expensive one - more expensive than regular slide film, and far more\nexpensive than regular B&W - I don't think I'll bother again, I'll stick to\ncolour slides and B&W negs.