I agree with Mike F. XTOL may be the last film developer to come out of Kodak R&D. It is a D-76 update. It is high in human and environmental safety with improved grain and sharpness compared to D- 76 and T-Max. When diluted, speed increases by 1/3 to 1/2 stop with no grain increase. Increased dilutions result in characteristics similar to a non-solvent developer. The Film Development Cookbook by Stephen Anchell and Bill Troop discuss Xtol and PMK. Full frame enlarged 8x10s with 35mm FP-4 souped in Xtol 1:1 have almost no grain. PMK will extend highlight separation by 2 zones from what I read.(posted 9147 days ago)