Agfa 304 Rapid Fixer

I was looking for a formula that would use up some of my ageing stock of sodium thiosufate and thought I’d try this one from the Darkroom Cookbook (Formula #124). The combination with ammonium chloride results in a faster fixing action. I also find it fairly odourless.

  • Water at 52°C‡ – 750ml
  • Sodium Thiosulfate – 200g
  • Ammonium Chloride – 50g
  • Potassium Metabisulfite† – 10g
  • Water to make 1 litre

‡Hypo (sodium thiosulfate) is endothermic, which means that it absorbs heat as it dissolves, hence the warm starting temperature.

†The metabisulfite is to acidify the fixer; I reduced the amount from that stated, using half, as I use this fixer with films processed in PMK where an acid fix can sometimes affect the desired negative staining.

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