From: clay (wcharmon@wt.net)
Date: 01/25/02-03:03:00 PM Z
I'm curious. You mentioned LiPd. Are you doing tests using POP pt/pd
(Ziatype or Ware process) or are you doing develop out?
I did some basic step wedge tests using Na2 and the bottom line seemed to be
that 1 drop of Na2 substituted for 1 drop of metal in a 6/6/1 ratio of
sensitizer/metal/Na2 had exactly the same contrast increasing effect as
using a 3/3/6 ratio of sensitizer 1/ sensitizer 2 (Pt) with chlorate/metal
salt. I was doing the develop-out method with potassium oxalate developer at
90 degrees F. I noticed a paper speed _decrease_ with the Na2 almost
identical to the speed loss associated with using the #2 sensitizer solution
in the above-mentioned ratio.
Clay
----------
>From: Witho Worms en Jorien van Santen <verzet13@xs4all.nl>
>To: alt-photo-process-l@skyway.usask.ca
>Subject: Na2PtCl6
>Date: Fri, Jan 25, 2002, 1:58 PM
>
>Linas, today I did some printing and made a fast test with the Na2PtCl6. I
>used it as a 25% substitute for LiPd and made a few big prints, 0,5 and 1 ml
>of sensitize.What I found was that it compresses the darker values in the
>print. The get the same dark tones as in a print without Cl6 I had to reduce
>my printing time. The faster printing time gives the impression of a harder
>print. As far as I could see the lighter values in the print were almost not
>affected by use the CL6.
>
>
>Witho
>
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