On Fri, 12 Dec 2003, Liam Lawless wrote:
> A caution about APH/S and reversal. Long time ago (before 9/11) I
> bought a large box of APH, but with reversal processing found it gave
> faint oyster shell markings in certain areas of the image. It hadn't
> done this before, and it was fine with conventional processing.
> Freestyle couldn't offer any explanation, so I finally put it down to
> X-ray damage. However, in recent correspondence Bob Nugent says he's
> observed the same fault (also on large sheets, I believe). Don't know
> if the film would be X-rayed on internal flights or if it goes on
> aeroplanes for US shipping, but I suggest testing with a small box
> before making a big investment in film. I've given up on APH until I
> hear an explanation for the problem, and am now trying to do digital.
> :(
Liam, I'm trying to figure what "oyster shell" markings look like, because
the reversal markings I got are basically stripes (oyster stripes?). As I
recall, at the time we hypothesized that it was only the large size... I'd
reversed 11 by 14 lith from the same source and didn't get the problem --
possibly some kind of defect in manufacturing (?), possiblity strengthened
by fact that Bob Nugent,in the southwest US, likely got his by ground not
air (unless he was in an all-fired hurry?). What size was he using?
Judy
Received on Fri Dec 12 13:25:03 2003
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