It should be all right. It may turn a darker color (Rodinal goes from a pale wheat color to very dark brown over its life), but you likely will not have to adjust the developing time from your preferred time. I've read tales of bottles of this stuff being fished out of bombed- out ruins in Hamburg, long after the end of the war, and still being quite usable.(posted 9282 days ago)And it appears that Agfa has responded to the howls of Rodinal users, and reintroduced it in the 16-oz bottle --- much more economical.