Photographers' Formulary TF-4 Archival Rapid Fix 1 Liter, to make 4 Liters No need to use hypo clearing agents You can also use TF-4 on TMax films, fixing for 6 minutes TF-4 is a non-hardening fixer, works well in batch processing Stock solution has a 1-year shelf life, makes 1 gallon Best for pyro developers as compared to conventional fixers