As has been posted before by myself and others, developers will last a lot longer if stored properly. If stored in glass jars ( I use canning jars) filled to the top and tightly sealed, developers can last years and only slightly change color. I have both C-41 and RA-4 developers I mixed in 2008 that are still giving excellent results. Rather than mix from concentrates as I need developer, I mix a whole batch and store it away.
Originally Posted by EdSawyer