From: Manuel Galán Molina (mgalanmolina@hotmail.com)
Date: 02/06/03-09:38:58 AM Z
Hi list.
Two years ago, i think, somebody put on the list a process to obtain paper
negatives by reversal. I have mailed another process, see below, but i want
to compare the two process. Anybody remembers this, or something like this?
I put this email in the pinhole list also, sorry for duplication if anybody
is on both list.
Thanks
Manuel, Spain
My process (from http://www.rit.edu/~andpph/faq.html)
PROCESSING ENLARGING PAPER AS A POSITIVE
...means you can use the paper in a camera and make one-of-a-kind images...
...roughly collected from info seen in various rec.photo postings...
If you use the paper as a material in the camera then you may wish to
consider
using Panalure for "normal" looking results in terms of tonal reproduction.
This is becasue normal B&W papers are not sensitive to red and thus anything
colored red in a scene will turn out very dark or black.
You can also make B&W prints directly from slides this way. Place a slide in
the enlarger and project it onto B&W paper. Again, to maintain more natural
looking tones use Panalure.
The chemicals and processing steps are as follows:
First Developer 60-90 seconds
Rinse 30 seconds
Bleach R-9 30-60 seconds
Rinse 30 seconds
Clear CB-1 30 seconds
Rinse 30 seconds
Expose to light 40 W bulb for 5-10 seconds at 12 inches
Second Developer30-60 seconds
Fix 30-60 seconds
WashNormal paper washing time
Dry
First Developer: The original literature referring to this method of making
positive prints from slides is Kodak Publication G-14, "Direct Positive
Photography". You can probably get a copy of it by calling the Kodak Hot
Line
at 800-242-2424. In any case, that booklet specified a high contrast
developer
such as D-88. Dektol or D-72 dilited 1:1 can probably be substituted
successfully for D-88.
Rinses should be under running water, or at least two changes in the 30
seconds.
The bleach is modified Kodak Bleach R-9:
Water 800 mL
Potassium Dichromate9.5 g
Sodium Bisulfate 66 g
Water to make 1 L
Clear CB-1:
Sodium Sulfite 90 g
Water to make 1 L
Second Developer can be Dektol again. Or if you want a sepia toned print,
skip the light exposure and use Sulfide Redeveloper T-19 (Sodium Sulfide
20 g with water to make 1 L).
As with any positive process, the resultant density value is opposite from
ordinarily processed paper: More exposure = lighter print, less exposure
= darker print.
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