I recently discovered that some of my bottles were "Type 7" plastic, not suitable for storage. Everything that went in them went bad: Dektol, Fixer, it all turned brown. I finally caught a clue and dumped them in the trash. My wife was throwing away one of those large, liquid laundry detergent containers which is "Type 2" high density. Is this what the big 5 gallon bulk storage/floating lid containers are made of? Is this okay for fixer, developer, all of it, none of it? BTW: I did search the archive first!