titrisol said:
On th econtrary, sulphide/polysulfide (Brown toner/Viradon) is highly archival
Yes, Kodak brown toner for sure is highly archival, possibly more so than selenium, gold, platinum or palladium.
I tried briefly to make Kodan Brown toner work with kallitype but did not have much success. I feel certain that one could work out procedures that would work with VDB and kallitype, but I gave up on it because of the objectionable odor of this toner. It literally smells like rotten eggs and the smell from one toning sessions will last for days.
BTW, I don't find the use of selenium, gold, palladium and platinum toners to be all that expensive. Selenium in fact is almsot dirt cheap, and you don't need very much of the other metals to tone a print. For example, it takes only about 1/5 as much palladium metal to tone a kallitype as it does to make a straight palladium print, which makes it fairly economical to tone with this metal.
Sandy