Quote Originally Posted by Michael R 1974 View Post
That is disturbing to say the least. I have always needed significantly longer times than Kodak recommends for XTOL/TMax films, and my times have always been consistent. I have no explanation for this. Perhaps someone else should run the tests.
In addition to a pre-soak, here are a couple more ideas:

* Inaccurate thermometer (are all times longer than expected?).
* Something in tap-water damages XTOL. (BTW, I use distilled water because my tap-water is hard).

If you don't mind running another test, you could do so using your times and process that are known to work. But AndreasT and you have already reported upswept curves, so maybe we already know what the result of another test would be...