TF-3 is particularly recommend for PMK and other staining developers. TF-3 will wash out of negative and print materials more rapidly than will an acid fixer. The formula for TF-3 was disclosed for non-commercial use only. TF-3 is not recommened for use in open trays for print fixing due to it's faint ammonium odor. This formula is similar to Photographer's Formulary more concentrated and less alkaline TF-4.
STOCK SOLUTION
| Chemical | Amount | Units |
|---|---|---|
| Ammonium thiosulfate (57-60%) | 800 | ml |
| Sodium Sulfite (anhy) | 60 | g |
| Sodium Metaborate | 5 | g |
| Distilled water to make | 1000 | ml |
USAGE
Dilute 1:4 for use. Fix the film for three times the clearing time,
usually 3 to 5 minutes. Fix paper for 1 full minute with continuous agitation.
A hypo clearing agent is not required.
CAPICITY
Approximately 20 8"x10" prints or films per liter.
NOTE
To obtain maximum image stain with PMK, reduce the
sodium sulfite in TF-3 or eliminate it
altogether. If you do this, the life of the working solution cannot be
guaranteed beyond one day, but you will achieve the maximum imagewise staining
of which PMK is capable.
REFERENCE
TF-3 Alkaline Film Fixer,
The Film Developing Cookbook,
Stephen G. Anchell and
Bill Troop, p. 106
The Darkroom Cookbook,
Second Edition, Stephen G. Anchell, p.215.
TF-4 Archival Rapid Fixer, No. 03-0141,
Photographers' Formulary (800-922-5255).