U of S | Mailing List Archive | alt-photo-process-l | Re: Van Dyck and Kallitype

Re: Van Dyck and Kallitype

If your question is whether you can substitute Fe(III) oxalate with
Fe(III) sulfate and alkali metal oxalate, I think the answer is
positive, although I didn't test kallitype this way. Fe(III) oxalate is
more stable than complex involving sulfate, and water should be the same
as long as the pH is same... (but then you probably thought about it.)

Sulfate is generally not reactive in silver chemistry. (Gelatin gets
affected by it, though.)

But was your point somewhere else?