Response to Old b&w film

This might help if you're really stuck - it's from a page in my old standby book - the Amateur Photographer's Handbood - for trying new developers or old emulsions. Cut off a small piece of film and expose it to white light (not sunlight). Immerse half the piece of film in the developer and start timing how long it takes for the submerged portion to start darkening. This could be somewhere between 6 and 60 seconds. Multiply this time by 20 and this will be your time for developing to normal contrast. I tried it some years ago and it worked. It had a footnote of interest to you - if the film is very stale increase the multiplication factor to 30. Good luck. Harv.

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