Hello: Rescued more stuff (prevented demise in trash) from work.
1) 4 x 20 packs of refrigerated out-of date (2000) Polacolor 59 ER 4x5 film. I understand this stuff shifts blue with reciprocity failure as well as aging. Will a yellow filter improve this? Or should I just play with it? 2) alt-process question - that list was too active for me to keep up with reading and I unsubscribed. I don't want to resub for one question. I was just given a 12"x18" (13"x22" glass) portable UV exposure unit, only used once or twice and stored 10 years. has six F20T12/350BL lamps close-spaced, no diffuser about 1" from 1/4" glass contact frame. Is this a good candidate for argyrotype/kallitytpe etc.? Had it been a high power metal halide or mercury lamp I'd be concerned about the heat generated. I don't know of BL lamps work for this with practical exposure times or BLB are required. Thank you Murray
