hi there,
Fixer: can be used for 10-15 rolls of black and white film, as long as you use stop bath. This is at 1:5 solution from concentrate.
Some people use two fixer baths: fix for half the time in the old almost exhuausted solution and half the time in a fresh fixer solution. This way you can use the same solution for another 10 rolls of film or 20 sheets of paper.
Stopbath: Kodak indicator stopbath, the smelly one, can be used until it turns purpllish.
Because developers are alkali and most fixers are acidic, you will exhaust your fixer much faster if you do not use stop bath. Stop bath is useful to maintain consistency in your developing routine and cheap so why not use it.
Developer: best to use as one-off solution but some types can be used over and over, just replenish with concentrate. You can't predict the behaviour of developers that have been used multiple times, so how to compensate for developing times? Better to use one off.
Photflo: dip your fingertip into the bottle, rinse that into your last wash in your plastic tank and jiggle film about for 15 seconds, soak for 30 seconds, dump. No need to keep a stock solution just use one off. That kodak bottle will last until you lose interest in doing your own films.
Hypo clear: can use until turn bluish but best to change to fresh solution after about5-8 rolls films or 20 sheets fiber paper. something like that.
