From: Clay (wcharmon@wt.net)
Date: 05/26/03-05:16:44 PM Z
Sandy;
Here are some starting points:
These tests were done with 100% palladium with 6 drops metal /6 drops
ferric oxalate and potassium oxalate at 110 degrees on air dried
Platine and exposed for the time necessary to merge steps 2 and 3 and
discern a small difference in step 4 (on my machine 250 nuarc units).
All data were plotted and analyzed with the Phil Davis plotter program
Na2 was diluted to 25% of delivered strength with distilled water and
added in addition to metal / FO load
0 drops NA2@25% ES=1.86, Emin = 2.7
1 drop NA2@25% ES=1.5, Emin = 2.42
2 drops NA2@25% ES=1.24, Emin = 2.04
Shadow speed points (Emax) stayed within 1/3 of a stop of each other
With other developers and papers, your mileage may vary. Obviously,
with larger drop counts, the control in contrast is much finer. This
should give you a jump start.
Clay
On Sunday, May 25, 2003, at 08:12 PM, sanking@clemson.edu wrote:
> Does anyone know if it is possible to control contrast with pure
> palladium printing with dichromate when developing in either ammonium
> or sodium citrate? And if not, can someone supply details on the way
> to control contrast with Na2, which I have been told is a wonder
> worker.
>
> Sandy
>
This archive was generated by hypermail 2.1.5 : 06/02/03-05:13:38 PM Z CST