Response to TMAX Developer... when should I throw it?

If you save the narrow leaders that you cut off of the film before developing, you can use them to check the fix. Fresh fixer might clear felm in 45 seconds. If it takes twice as long, the fix should be discarded. The product named Hypo Check costs about a penny per check, but is more sensitive than using scrap film. As for developer, with less expensive developers, using once and disgarding is practical and safe. I mix T-Max developer a liter at a time, and run maybe 20 or thirty rolls of film through it over several weeks, increasing developing time gradually until I might develop an extra minute before disgarding the developer. It isn't scientific, but, by closely checking the film for proper development, it works for me.

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