I have found Rodinal one of the most robust and reliable developers available. I have a part-used bottle,dated 1996, which looks like black coffee but still works!(posted 8605 days ago)Kodak T-Max 100, rated at 50 ASA, and devved in Rodinal 1+ 49 (yes, I know!- but it make the arithmetic easier!) for 7 1/2 mins gives very, very fine grain and superb sharpness. N.B. - I'm using a condenser enlarger.