ONLY for sodium thiosulfate fixers. I conducted an
experiment using H2O2, hydrogen peroxide, to
destroy the fixer and so release the silver.
At the time I had been using potassium
iodide as per Kodak's FT-1 test for
testing the fixer's condition.
All went as expected. The silver precipitated
as a brown-ish flocculant. Likely the oxide or
hydroxide of silver. Add acetic acid to that
and you've silver acetate. Dan