Fixing agent: sodium/ammonium thiosulfate (dissolves unexposed silver)
Hardener: potassium alum (hardens the gelatin emulsion in film)
Acidifier: sulfuric/acetic acid (removes residual alkalinity from previous developing)
Developer: hydroquinone (for high contrast) + Metol or phenindione (for low contrast). The developer reduces exposed silver in the film to form metallic silver.
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