FP4+ in TFX-2 (Photographers' Formulary version of FX-2): standard dilution 50 mL solution A, 50 mL solution B, add water to make 1 L. 11 minutes at 20C (68F), EI 160. Agitation for the first 30 seconds, then 10 seconds (4 inversions) every 60 seconds. For diffusion enlarger.(posted 8574 days ago)