1) Does platinum paper (50 percent palladium, Bostick and Sullivan
chemicals, ammonium citrate developer) have a reciprocity problem?? For my
own in camera negs (aimed at a contrast for G3, so I don't use much #2
solution), I can measure my shadow values and my highlight values (verses a
step table), determin my grade and printing time (typically between 7 and
15 minutes under a bank of uv tubes) and get a "very close" print. When I
try and print friends "silver" negs (a lot flatter and thinner than mine) I
always end up way off (always too dark).
2) More neurocis, what can I use to clean the black stain (platinum??) from
the small beaker I mix my platinum chemicals in?? EDTA in normal
concentrations does't do it, strait stop bath doesn't do it, grocery store
silver polish doesn't do it. I assume that pure platinum might be a
comtaminant (??) and thus would like to keep this cleaner.
tomf2468@pipeline.com (Tom Ferguson)