Aggie--We're on the same page then. The concentrate is, however, in small foil packets which must be cut open immediately before use. There's no practical way to use the old marble trick as with a bottle of HC-110 or T-Max Developer. I was simply wondering if refrigerating the sealed packets would prolong their life so that a supply could be cached in case Kodak drops the product. From the answers posted, I'm assuming that would either be a bad idea or would be of no particular value.
jdef--Is TD-3 a liquid or a powder? How about cost? Have you tried it with anything besides Tech Pan?
Again, thanks to all who took the time to respond.