Sandy, I don't use or test a pure palladium. The smallest amount of platinum
that I add is 15% of total metal salt solution. I make my own ferric oxalate
and use a palladium solution that is mixed at 5 g NaPd with 3.5g NaCl to
make 40 ml. This makes a .7 M solution to match my .7 M ferric oxalate. The
Platinum is a .457M solution in potassium version and .7M when I can get the
ammonium version. The molarity may be off by +/- .015 as these are from
memory but I don't think so.
My exposure scale for the 1.0ml FO, .15ml K Pt, and .85ml Na Pd, is 2.45.
I make most of my exposures after a 10 minute dry@ 100F and a 30 minute
humidification @60% RH. I process in Potassium Oxalate at both room temp of
70 and heated to 90F. The exposure test that produced the ES above was
processed at 70F.
These test were also performed with Starphire glass in the contacting
printing frame.
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
Received on Mon Oct 3 12:00:17 2005
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