[quote="Annie"]The archival aspect seems promising but I found the selenium toned print has a very different look from the Pd toned print I made and it did not just relate to the colour shift, there is greater contrast with Pd and more 'open' midtones.

Annie,

In my earlier response I did not address the aesthetic aspects of color and the impact of the toner on image appearance. However, you make a very interesting observation about print values and I have the same impression from my work in kallitype. Toning with platinum and palladium seems to open up the midtones and gives a greater sense of luminosity to the print. Toning with selenium just kills the luminosoity.