I never cease to be amazed at the quality of responses on this forum, in this case to a question that properly belongs on the Printing & Finishing forum (where it was also posted).(posted 8570 days ago)I find that I am behind the times on this archival stuff. Where can I find references regarding research about the archival effects of toning? I believe John Hicks mentioned Nishimura--has he published a book? It sounds as though, if I obtain the long-sought split tone effect, I will need to use Agfa Sistan to stabilize the image. But there is also a warning that Sistan has never been tested properly. Maybe we could write to this Nishimura guy and ask if he has tested it, or plans to test it (?).
I used to tone my Oriental Seagull prints in selenium until they turned quite reddish-brown--particularly landscapes (one of those 15 year-old images has been hanging on my wall all this time, with no apparent ill effects). On the one hand, I am gratified that my love of a deeply-toned print has proven to be "the way to go," but I also treasure the three-dimensionality that the split tone effect provides and don't want to give it up as an aesthetic option.
And what about Wilhelm Research? They do all sorts of archival testing, but I find nothing on their site about black and white prints, except a warning against using RC papers. Do you suppose, if a coalition of fine-art photographers wrote to them, they could be induced to do some testing in this area?