Photographers' Formulary 03-0200 TF-5 Archival Rapid Fixer for Darkroom TF-5 is an extraordinary fixer for both paper and films. No image bleaching TF-5 Is mixed at a 1:3 Ratio to make 4-liters working solution Non-hardening Long shelf life Recommended in The Book of Pyro for PMK negatives, by Gordon Hutching TF-5 is an extraordinary fixer for both paper and some films. TF-5 works well in batch processing, fixing resin coated paper in 30 seconds and fiber based paper in 60 seconds. No image bleaching TF-5 Is mixed at a 1:3 Ratio to make 4-liters working solution