Geoffrey Crawley has formulated and dislosed FX 37, a developer optimized for both T-Max and Delta films. Crawley makes it clear that FX 37 is not just for use with tabular grain films.
"This black-and-white negative developer is proposed for the processing of modern films, especially those using so-termed 'high-emulsion' technology, such as T-Max and Delta. But it may be used for traditional type emulsions when the finest grain is not the prime requirement. It is an independent formula, not a substitute for any commercial product."
"FX 37 is designed to produce enlarging quality, very sharp, tonally rich negatives on modern films, with an EI speed increase. It is not a fine grain developer in the sense, and assumes that the fastest films will not be used when big [more than 12x] magnifications are required."
FX 37 fully exploits Phenidone's speed enhancing properties. For most films, true speed is a half to two-thirds of a stop more than the manufacturer's ISO.
STOCK SOLUTION
| Chemical | Amount | Units |
|---|---|---|
| Distilled Water | 750 | ml |
| Sodium Sulfite | 69 | g |
| Hydroquinone | 5 | g |
| Sodium Carbonate (anhy) | 5 | g |
| Phenidone | 0.5 | g |
| Borax (Sodium Borate) | 2.5 | g |
| Potassium Bromide | 0.5 | g |
| Benzotriazole, 1% Solution | 5 | ml |
| Distilled water to make | 1000 | ml |
USAGE
Dilute 1:3. Dilute 1:5 for longer developing times and increased film speed.
REFERENCE
FX 37 Film Developer, The Film Developing
Cookbook, Stephen G. Anchell and
Bill Troop, p. 61
FX 37 Film Developer,
The Darkroom Cookbook, Second
Edition, Stephen G. Anchell, p. 154.