Fixing agent: Sodium or ammonium thiosulfate, which dissolves unexposed silver.
Hardener: Potassium alum, to harden the gelatin emulsion in the film.
Acidifier: Sulfuric or acetic acid, to remove residual alkalinity from previous developing1.
X-ray developer: Composed of hydroquinone and phenindione (Metol) to develop latent images into visible ones.
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