From: Nick Makris (nick@mcn.org)
Date: 05/14/00-01:19:08 PM Z
My thanks to Judy, Kerik, Eric, Carl and Jeffrey for their input to
resolution/tonal seperation problem I'm having with my recent prints. Some
clarification is required here.
First, let me say the problem is very subtle and that the negatives (8X10)
I'm using are digital negs from a Lightjet. The one in particular, contains
detail in both the shadows and the highlights and I have previously had
better results from this neg. and in conjunction with the print frame I have
been using.
This leads me back to the Ferric Oxalate change that I made recently, where
I am now using a one solution formula with no Potasium Chlorate. In mixing
the sensitiser, I am using equal arts of FO and PT/PD with one drop of H202
(3% drugstore variety undiluted).
The negs can be printed for either the highlights or the shadows but not for
both and some confusion exists herein about which way to proceed. My
preference is to print these negs as they exist and to change my coating
solution to include or not include something as opposed to changing my negs
or my developer. After researching the my archives I found that either
Postassium Chlorate, Potassium Dichromate, Ammonium Dichromate or H202 in
various strengths may produce the desired results, but I don't have a clue.
The key here is that these negs seem to have a contrast range that is
greater than what my procedure will print, but contain detail where I expect
to see detail.
It could be that the addition of H202 (which I was using previously with
success) is adding unneed contrast. I would have thought that with no
Postassium Chlorate I would have needed some additional contrast.
Some direction along these lines will be *very much appreciated*.
As for differentiating between tonal seperation and resolution - I also have
a hard time with that. These negs seems to have good resolution and tonal
seperation at both ends, however, I would be hard put to describe the
difference between them except to say that I am able to see differences
within the same tonal range.
Many thanks,
Nick
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