I was given a Rodinal 100 ccm glass bottle today. Any idea how old it could be? It's about 80 ccm left in the bottle. When I have time I will try to develop a roll in it, but I'm not sure wich dilution and time I need, same as R09? I was also given 4 packets of Tetenal express fixer salt. Is it worth trying or just garbage? It's about the same age as the Rodinal bottle. And I got a bunch of other darkroom equipent. Opemus 4 enlarger (looks like it almost brand new), trays, bulkloader, developing tanks etc.