THE PROCEDURE FOR PLATINUM AND PALLADIUM PRINTING
Once the negative has been created, the printing process becomes relatively simple.
You start by cutting the paper to size. I use the Arches Platine or the Bergger COT 320 and, more rarely, the Washi 45gr. You have to avoid the use of metal tools since the poor that could be generated in the act of cutting the paper could negatively affect the print.
In fact, the emulsion reacts with the metal.
You prepare the emulsion with the right balance of Platinum, Palladium, Oxalate Iron and contrast agent (if necessary). Then you spreads it on the paper with fluid movements. This part will determine the final yield of the external area of the print giving it the typical “brushed” appearance.
THE EXPOSURE PHASE
You proceed to position the negative and the next exposure phase after approximatively 30 minutes. During this time the emulsion will dry.
I get the irradiation to ultraviolet rays through a special oven that I made with the help of an electrician and a little DIY.
This is also a typical feature of the print. The quality of the bromograph, will determine the the exposure time and its quality. The height, the number of lamps and their power will determine the exposure time. This, usually, is not less than 10 minutes.
Once the exposure phase is over, the most exciting part of development begins. Unlike the silver salts print, platinum and palladium printing is revealed in a few moments. The full development, however, takes about 2 minutes.
It then goes to the clarification phase with three consecutive washes in citric acid.
All the work ends with a generous wash in running water.
If everything went well, the result will be extraordinary!