sanking
Member
cjarvis said:With whom did you correspond?
I would imagine that Dr. Michael Ware or someone at IPI (Jim Reilly), RIT or the GEH (maybe Mark Osterman would be a place to start) would have a pretty good handle on exactly what's happening with toning in gold.
Etienne Garbaux and Ryujij Suzuki among others. The discussion was on the alt-photo-process list in October, 2003, in a thread called Test for Silver Metal in Print? If you read the thread and look at the comments you will find that some of the folks who weighed in on the subject are scientists with quite a lot of knowledge of the issue.
My original premise was that the silver metal could be completely replaced, which if true would mean there would be no difference at all between a palladium toned kallitype and a regular palladium. However, based on these discussions I concluded that 100% replacement of silver with one of the more noble metals does not appear to be possible, or if possible it would be more complicated than just to make a print with the more noble metal in the first place.
My own interest in the matter was satisfied by the discussion because the practical implication on image stability is more important to me than the theory. Whether the process is replacement, encapsulation, or something else the end result is that toning a kallitype in either gold, palladium or platinum gives it a lot of permanence. Selenium toning offers similar, or even greater protection, but the theory of selenium toning is already fairy well understood.
Sandy
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