FX39 Returns


Adox has announced the return of FX39.
The formula was originated by Geoffrey Crawley. FX39 is a one shot developer designed to be used at high dilutions for Delta and T-grain films. It was formulated for sale by Paterson, but they dropped it.

“If grain is too fine, light scatter in the negative increases when a negative is enlarged, reducing edge contrast.” — Crawley

39 Is Not 37

The formula for FX39 is proprietary, but Geoffrey Crawley published a close cousin, FX37.

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.


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


Dilute 1:3. Dilute 1:5 for longer developing times and increased film speed.