I've been using Agfa Sistan, and per the information in Tim Rudman's excellent book -- The Photographer's Toning Book -- I've been using it completely. There is nothing on the Agfa bottle that specifies how many prints you can get out of the stuff, and I see no reason to doubt Tim's information. His book is exhaustive.
However, I'm getting a purple sediment in the Sistan working solution. I'm wondering if I should filter this stuff out, or just agitate it until it is mixed back in. Any thoughts?
I would not want to remove any active ingredient in the Sistan, but I don't want to have crud on my prints either. You don't wash prints after using Sistan -- that's according to Tim (once again there is nothing on the Sustan bottle about that).
However, I'm getting a purple sediment in the Sistan working solution. I'm wondering if I should filter this stuff out, or just agitate it until it is mixed back in. Any thoughts?
I would not want to remove any active ingredient in the Sistan, but I don't want to have crud on my prints either. You don't wash prints after using Sistan -- that's according to Tim (once again there is nothing on the Sustan bottle about that).