Hi everyone, I bought some darkroom equipment about two years back and with everything came a box of chemicals. All kodak brand: - Indicator stop bath 1 pint (liquid) opened but sealed - Photo-Flow 200 (open) liquid - Dektol Developer (powder) new packaged - Developer D76 (powder) opened in ziplock bag - Fixer (powder) open in ziplock bag everything had been on a box for about two years non touched in about 65 degree temperature. My question is, if any of this is still good to use? And if I mix them into gallon jugs how long will it last in the jug? And what can be reused and what not? I took a class long tome ago and can't remamber what I can reuse. Please help. Thanks a lot!