Have a look a Tetenals webpage. There you'll their collection of development times for all their developer and most films. The data sheet number is A075 for FP4 in Neofin Red/Rot. I looked up the pdf file on my harddrive, they give you a beta versus time graph. So for a beta of 0.55 it is about 5 mins with 3 sec agaition, the 1 min agaition will hardly give you 0.55 at 15 mins. Usually they recommend certain times but not on this sheet, so maybe Neofin Red and FP4 isn't the best combination. So have a look at their webpages...(posted 8995 days ago)Wolfram