Pretty sure I know the answer to this, but I have some DD-X, Ilfostop and Rapid Fixer which are in opened bottles. How long opened? I'm guessing at least 8 years, maybe up to 10. There's a tiny part of me that says shoot a test film and see how it goes but I don't want to waste my time or get crappy/no results. Time to say goodbye, and just get some new stuff? If so, hello Rodinal!