Platinum/Palladium Notes

Potassium Oxalate Developer

Introduction Potassium oxalate (which I abbreviate KO) is my preferred developer for platinum/palladium printing. Compared to the other commonly used developers for Pt/Pd printing, ammonium citrate and sodium citrate, KO produces a notably warmer image hue which is a quality I seek in most of my printing. Heating it – I usually warm it up… Continue reading Potassium Oxalate Developer

Formulary for Pt/Pd Printing

Ferric Oxalate Solution (25%) Solution A: 25 gm ferric oxalate powder 2 gm oxalic acid – may increase printing speed and Dmax 88ml distilled water at room temperature stir constantly until solids have completely dissolved (~8 hours) add distilled water to bring to 100ml if necessary Solution B: add 0.6% potassium chlorate to Solution A (e.i.… Continue reading Formulary for Pt/Pd Printing

Na2 Serial Dilution

Contrast Control for Palladium Printing Using Sodium Hexachloroplatinate A serial dilution is a series of stepwise dilutions of a substance in solution. Usually the dilution factor at each step is constant, resulting in a geometric progression of the concentration in a logarithmic fashion. Serial dilutions are used to accurately create highly diluted solutions as well… Continue reading Na2 Serial Dilution

Na2 Contrast Control Chart

Volume indicated comprises equal amounts of Ferric Oxalate (FO) and palladium solution (Pd) to which is added 1 drop of the indicated concentration of Na2 solution. For most papers I also add 1 drop of Tween 20 per 1 ml of solution. Example: 2ml = 1ml FO + 1ml Pd + 1 drop 5% Na2 + 2… Continue reading Na2 Contrast Control Chart

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