Thanks for the replies still trying to get some clarity.
Best test is looking at IR density of your negs in an ICE capable scanner, about 10-20% IR light loss is good in my experience, anything higher warrants a rebleach/refix.
IR as Infrared ???
Hmmm rarely use Epson Scan program but it has ICE. So we scan it and then what... how do you determine the IR loss to non ICE scan? Totally in a new area.

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another way to sorta check is to take a junk piece of film, already processed, cut a bit off, and give it another 5 minutes or so of bleaching (fix and wash also).
Will give this a try, and we tried to find your testing procedure but couldn't find it, could you give me a specific location. Thanks..
For people who run control strips there's a specific test patch for bleaching - it's a very good test, and pretty sensitive. (I explained it once on this site if anyone is interested.)
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Sorry was not real clear with question...don't think it really makes a difference but:
We developed then we used a stop bath of distilled white vinegar 1:4 (mixed with distilled water) then normally do a plain water rinse for 30 to 60 sec, then do the bleach.
So the stop bath was actually rinsed off with the bleach, that's why we like to check it out, plus the fact that were using the same bleach for a second development group.
(Purchased another and mixed the Developer and using it
still with the first groups Bleach:
Developer: Flexicolor LU Replenisher (8231672), C-41 Developer/Starter LORR (6601074)