Exactly 8 years ago (that's going so fast), I toned silver bromide print with
an "ammonium ferric citrate/potassium ferricyanide" blue toning bath. Giving a
quite similar colour and chemical substance than cyanotype. To ensure
permanency I re-toned everything in the selenium soup. I was convinced of
course I had found "the way" and could sell the whole stuff with a label
behind, "selenium toned" as a guaranty that my work will survive myself.
I was wrong, I think that selenium even did the things worst.
..sous les ponts de Paris...
Philippe.
http://www.knoware.nl/users/philippe/