I am setting up a brand new darkroom and have only had access to the one at school, so all chemicals were mixed for me and taken care of afterward. I know that all developers are disposed of after use, but when using my own darkroom and chemicals are mixed in bottles, do I return the fixer, hypoclear and photoflo to the containers after use. In the darkroom at school, all chemicals were removed with a beaker from large tanks and then returned after use. Will I follow the same procedure with my own, by pouring off into the bottles they are mixed in? Also, when tray processing in your own darkroom, are chemicals discarded after each use and how long can they stay in the trays between use. Is there a good simple book on setting up and maintaining your home darkroom?(posted 8489 days ago)Thanks so much, Terri Shaver Fledgling photographer