markinlondon
Elmar user
javimm said:Ilford says 2-5 minutes for fixing, so I supposed almost 4 min is enough. I stored the used fixer with the intention of using it again. How much can I store it? One month?. The Ilford bottle with the concentrate fixer should last longer, I think, maybe 6 months. How much have you experienced the fixer to last (in time, not in number of rolls)?
To test fixer, drop the leader you cut off into the fixer in daylight and agitate constantly. Time how long it takes to clear completely. Use at least twice this time for fixing in the tank. 3x is OK, 10x is overdone to give you an idea of how much safety margin you can leave. I get about 25 rolls from a litre of stock Ilford Rapid Fix. I run this test every 5 rolls or so. When the clearing time for a particular film has doubled the fixer is exhausted and should be discarded immediately. Do not try to squeeze out another roll at this point.
Tri-x has quite a long clearing time, just over a minute in fresh fixer (Rapid FIx 1:4) so I give it three minutes . By testing as you go you calibrate your process and can't go wrong.
The concentrate should last ages. I've had bottles of concentrate for well over a year. Even the working solution will last for months without going bad.