Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Sat, 09 Oct 1999 20:58:36 -0400
Two more studies reveal further optimization of the Pt/Pd process.
The first involves the determination of a threshold of coating mixture
concentration for the DOP ferric oxalate (FO) sensitizer and metal
solutions. For the Crane's paper used, this study finds a threshold
based on a sensitizer concentration of 26%. Good news for all those
using the standard 27%. This study may be found at the following link.
http://home.att.net/~jeffrey.d.mathias/guide/DOP_threshold.htm
It is interesting to note that the threshold for POP using Ammonium
Ferric Oxalate (AFO) was found to be 35% for this same paper. This
requires about 50% to 65% more metal as that for DOP using FO. And the
DOP print will have more depth and substance to boot. However the big
plus of POP using AFO is the more neutral or cool colors possible. To
get those colors will cost an additional 50% to 65% more metal. PLEASE
NOTE that this is to get "optimum" results, as one can always produce a
weaker print using less metal. Also remember that more than "optimum"
metal does not improve the print any as it has reached the threshold.
The second study investigates the effect of various concentrations of
Oxalic Acid in the sensitizer solution. For the materials used in this
study, results showed a slight benefit to have an Oxalic Acid
concentration of between 2% to 5% in the sensitizer solution. This
study may be found at the following link.
http://home.att.net/~jeffrey.d.mathias/guide/oxalic_acid_study.htm
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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