WARNING! read the following post by sanking first, this post contains some errors... cheers, annie.
OK just one more posting.......
Here is a link that is interesting because it mentions that one of the toned prints in the study as revealed by the analysis was in fact 100% platinum.... (actually the entire article is interesting)
However, Nadeau discusses here.......
that when any silver remains the photograph is actually more vulnerable.... So to have the best of all worlds I will be testing toning my silver photographs with a combination of Pt/Au..... I am anticipating an opening of the midtones with the Pt and the assured permanence of the Au.