Quote Originally Posted by ChrisC View Post
This has me thinking. The ratios were right but I did add the chemicals together than added the water at the end. Seemed harmless at the time but I wonder if it could have been enough to make this happen.

After running another test tonight with a rubbish 4x5 sheet of Portra 160NC and getting a similar result, I'm starting to wonder if that could be it. My developing was done completely in a waterbath that didn't budge off exactly 38C for the whole development cycle, and only fell 1C during the blix cycle. Not a temp issue, I'm beginning to believe.
It's definately an issue if you do it like that, unless you thoroughly mix part A with part B before adding C, and even then I wouldn't do it, try a small fresh batch on 35mm mixed up into water, also much easier to tell when fully mixed