I don't know if film is relevant, but it is efke 25 and arista EDU 100 and 400 I bought D76, Dektol (which is D72, right? ) and kodak professional fixer. I need to know what concentration of 5% vinegar to use for the stopbath How to test the fixer for exhaustion. Some iodine salt method? Silver recovery, can I hook up iron/carbon electrodes to a battery charger and recover the silver? Or do I need a reference electrode and it's much more complicated. efke 25 and arista EDU. Are they tablet or cubic films? Am I missing anything obvious?