Ziatype and brown image color

Richard Sullivan (richsul@roadrunner.com)
Thu, 16 May 1996 22:41:02 -0600

I've been having a devil of a time producing consistent brown image color in
the my Ziatype. By adding a small quantity of cesium chloropalladite to the
emulsion I was able to get a fairly nice brown color, but then suddenly I
couldn't get it anymore. I discovered that I had begun putting a sheet of
acrylic on the back of paper in the print frame as a way of holding in the
moisture which is essential to the Ziatype system. Previously, as I surmise,
what was happening was that the printout went along nicely in the first
stages while the print was still moist then the print began to dry, it was
as it was drying that the brown was produced. I think I confirmed this by
coating a piece of paper and drying the emulsion and printing without
steaming the print over the humidifier. Very little printout image was
produced, so I steamed it after removing it from the print frame, and the
image jumped out. I put the print in the acid wash and it turned out very brown.

All in all this is very nice, but hardly a controllable system for producing
brown prints. It seems that as the print dries during exposure, there is a
increasingly restrained development happening. The question that I have is
there any way that anyone knows of to chemically restrain the development of
a palladium print. I've tried glycerine to no avail. It tends to dry out as
the print is first dried. I've also tried the hackers approach and started
dumping all sorts of things in the emulsion, to wit: glycerine, zinc
chloride, zinc acetate, mercuric chloride, sodium oxalate, pot oxalate, EDTA
tetrasodium. No brown. In conventional palladium printing all you ever get
is brown, and black is the hard thing to get, this is just the opposite.

Any of you gurus out there have any ideas?

I hope all of my ruminations on this project doesn't bore the hell out of
everyone. I just figured that some may find it interesting and a little
different from the typical list topic.

Dick Sullivan
Bostick & Sullivan
Santa Fe, New mexico