Iron Palladium prints are an alternative to more costly Platinum printing, and are also know as Ziatype prints. The process was created by Pizzighelli and refined by Richard Sullivan of Bostick and Sullivan, in Sante Fe, New Mexico. Bostick and Sullivan is a supplier of alternative process chemistry and materials.
An emulsion is prepared by mixing together several chemicals. Mostly this is Ferric Ammonium Oxalate, and Lithium Palladium. Additives such as Ammonium Dichromate, Sodium Tungstate or Gold Chloride may be added to control contrast and image color. Just a few drops of each... about 40 in total... are whisked together to create enough emulsion to coat a piece of paper suitable for one 8"x10" print. In the dry climate of Alberta a page of fine art paper must first be steamed to impart enough humidity. Then the emulsion is coated on... I used a brush, but some use a glass coating rod.
Once the emulsion has dried, a negative is placed in contact with the paper, and the two are sandwiched into a split back contact printing frame. This is then exposed to a UV light source. Sometimes the sun is used, but I used some compact fluorescent black light bulbs in a mirror lined box that I fabricated.
This is a printing out process and no developer is needed. The emulsion slowly darkens with exposure to the UV light. The split back frame allows me to partially open up the printing frame, without shifting the alignment, and inspect the print as it darkens. Once it is as dark as I want it to be, I wash it in water, give it a clearing bath in a mix of EDTA and Sodium Bisulfite, followed by a final water wash. Then it is hung to dry. Exposure varied from about 10 minutes to over 40, depending on the mix of the various chemicals, and the density of the negative I was printing.
I used 8"x10" negatives that I had taken with my big view camera over the past few years. Some people work with digital inter-negatives created from smaller format images. I am a purist and prefer not to include digital technology in my work.
I've done some of this printing in the past, but it has been a while. I had to purchase some fresh chemistry recently in order to take another stab at it. It worked out well, though I did have a couple of minor coating issues. I will be attempting further printing work in the coming weeks and months.
Mostly this has demonstrated to me that I need to do more shooting with the big 8x10 view camera!



























