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Nanoscale Analysis of Humidity Dependent Tonal Appearance of Platinum/Palladium Prints

Platinum and palladium photographic prints are prized for their long and nuanced tonal range. Commercial platinum print papers were produced from the 1870s and continued to the 1930s. The printing practice continues today with self-prepared papers coated with the sensitive salts and often combining platinum and palladium metals. Many factors can influence the final appearance of the print, including the paper base, the metals used, the developer and the moisture content of the paper during exposure. While the importance of relative humidity (RH) on the printing process was long recognized, the structural changes in the printed nanoparticles that cause this change in appearance had not been observed.