RE: Ware/Malde-Ziatype-DOP palladium,was RE: "New" Paper for Pt/Pd (and other iron processes, too)

[Richard Sullivan <richsul@earthlink.net>]

That article is mostly about the discovery of the process and gives a big
hat tip to Pizzighelli. It was written in 1996 and much has been learned
since. 

The issue is rather than adjusting humidity to change color one changes the
metal in the double palladium salt. Lithium produces cool tones in a wide
humidity range and cesium produces warm tones in the same range. Thus the
color is mostly dependent on the double salt for its tonal coloration rather
than on the humidity level in the paper.

One can also use sodium tungstate or gold chloride as color controls as
well.

At the time I developed the process I really expected it to be a minor
process in the pd/pt printing world but it has proven to be a major sales
item and especially so for school orders. Christopher James in his book says
it the easiest of the platinum processes. In my classes at the local college
I have found that the students in general prefer the Ziatype and I think the
fact that it is a printing out process is the reason for their preference. 

Bostick & Sullivan puts considerable effort into research and development.
The Ziatype and NA2 are just two results from our efforts. We are now
producing carbon tissue and are soon to be producing 4 color tissues. Sandy
King got my carbon mojo running at APIS 2001 and we have spent countless
hours designing a machine and tissue formulation. We are currently exploring
several interesting processes and have hopes for their commercial success.

We now have an Epson 9800 and are producing negatives for several major
atelier printers. 

Many thanks to the folks here who have supported us for the last 27 years. 

--Dick Sullivan
www.bostick-sullivan.com



-----Original Message-----
From: Camden Hardy [mailto:camden@hardyphotography.net] the fact that it is 
Sent: Friday, December 01, 2006 5:29 PM
To: alt-photo-process-l@usask.ca
Subject: RE: Ware/Malde-Ziatype-DOP palladium, was RE: "New" Paper for Pt/Pd
(and other iron processes, too)

I wasn't making it up!  From Dick Sullivan's article, The Ziatype Compared
to the Ware-Malde Process found at
http://www.bostick-sullivan.com/techart.php:

"The lithium salt, unlike the rest tended to produce an almost blue black
image throughout a wide humidity range. Originally I was not particularly
looking for a POP process, but the apparent hygroscopicity of this
material pointed me in that direction.

My thoughts on this were that if I could find a corresponding "brown"
producing component that could be mixed with the lithium palladium salt,
we might have a system for POP printing that was largely independent of
humidity."

Am I completely reading this wrong, or does this say that ziatype isn't as
humidity-dependent as other palladium processes?


Camden Hardy

camden[at]hardyphotography[dot]net
http://www.hardyphotography.net