I got a completely blank roll!

Twigs: here is how you can test your developer:

clip off a piece of film, and let it sit in a cup of developer (in a lit room) for the normal developing time, then put it in the fixer.

black = developer is good
clear = developer is bad

I figured this out after loosing a batch of 2 rolls to some cross-contaminated diafine.
 
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