The title refers to 'FP5'. Eduardo, do you mean FP4 or HP5+?(posted 9188 days ago)When I used FP4, I developed in Paterson Aculux. HP5+ also goes in Aculux. I no longer use T-Max 400 (except for using up a few rolls occupying fridge space), as I prefer Delta 400, with Paterson FX39.