Actually, it's not Rodinal, it's R09, but it's supposed to be the same formula as the original Rodinal, isn't it? <br> So, here goes: I stored the developer in four 125 ml glass bottles, full to the brim. Well, actually three of them were full to the brim, while the fourth one was getting emptier with every developed film. Knowing that Rodinal-type developers last for ages even in partially full containers, I didn't bother using glass marbles, or butane, or anything like that. Over the course of about four months, the first bottle has got from full to almost empty, the developer working perfectly all this time. <br> But yesterday I was in for a big surprise. The film turned out completely clear, with just an extremely faint trace of images in the areas of the strongest highlights. :-(<br> I then did a test: I prepared two solutions, one from this bottle and one from a full bottle, and developed and fixed a piece of a 35mm film leader, in full light. This proved that the developer in the almost empty bottle was dead. :-(<br> The color was unchanged. It looked the same as the one from the unopened bottle. <br><br> What happened? Is the longevity of the Rodinal overrated? I don't think it's the "R09 versus real Rodinal" thing, because the legend of its longevity was born long before Agfa changed the formula. What went wrong? And why was there no warning, no change in color, nothing? Why was the death so sudden, like one film turns out perfectly and the next one, a couple of days later, completely transparent?