I use diluted Xtol at 75 deg. F in Patterson tanks. For 120 film I dilute 1+3, that's 4.5oz(133ml) Xtol + 13.5oz water per roll. For 35mm it's 1+2 dilution, 3.5oz(105ml) Xtol + 7oz water. I use a diffuse enlarger and develop films about 10% longer than the Kodak chart times.(posted 9727 days ago)Grain is ever so slightly smoother undiluted or at 1+1 but I am happy at the higher dilutions, except TMZ, which I develop at 1+1.