Chris Stone (cstone05@sprynet.com)
Sun, 21 Feb 1999 19:58:43 -0500
Carl,
I suspect you're right about the mismatch between the tubes and the
film. The grid marks didn't appear when I made the interpositive using FP4.
Pyro wasn't involved in that step of the process, so "filtering" wouldn't
seem to be an issue. I tried putting in another layer of diffusion
material, which helped, but didn't resolve the problem--and it's very
inconvenient in any event. I'll check with MIke about his idea about
"masking." Seems like it would be tough to make it work, but he seems to
have had success.
-- Matthew
-----Original Message-----
From: Carl Weese <cjweese@wtco.net>
To: alt-photo-process-l@skyway.usask.ca
<alt-photo-process-l@skyway.usask.ca>
Date: Sunday, February 21, 1999 8:53 AM
Subject: Re: negative puzzle
>Chris,
>
>This is just a guess but I think you are running into a mismatch between
>the spectral sensitivity of the specific film you are enlarging on and
>the color of your cold light tubes. The pyro stain somehow cancels out
>the problem, so might a "filter" of some sort. If this is a cold light
>with two sets of different color tubes, turn on the other set as well as
>the green ones and see what happens.
>
>I recently ran into streaks in negatives that only appeared in platinum
>prints: not when printed in silver, and not visible to the naked eye
>examining the neg on a lightbox. Apparantly the defects, whether caused
>in manufacture or in processing, are "visible" only to UV light. The
>manufacturer is examining them and I don't have a definitive answer
>about it yet. But you may have a somewhat parallel effect happening.
>
>---Carl
This archive was generated by hypermail 2.0b3 on Sat Nov 06 1999 - 10:06:53