Re: Selenium-toning Van Dyke Brown prints
On Mon, 25 Sep 2006 18:23:01 -0400, "sam wang" <stwang@bellsouth.net> said: > But I always wondered if it was the > selenium that affected the image or was it the acid - at 1:100, how > much selenium is there to do the toning, and so quickly? The recipe for KRST is proprietary and I am not Eastman Kodak, so this is nothing more than an educated guess. At 1+100, the amount of elemental selenium is about 60mg per liter, within a factor of a few. The solution is alkaline. > I believe I posed the question a long time ago, "Is there another form > of selenium that might be used instead of KRST, and would that do > better as a toner for VD" and don't remember ever receiving a good > answer. There is non-rapid selenium toners using sodium or potassium selenosulfate without ammonium chloride or ammonium thiosulfate or any of these. With silver-gelatin the toning is considerably slower than with KRST-type toner. If you are interested in post-fixation toning of VDB with selenium, this may be worth trying.
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