A fresh question first, did you rate the film at box speed?

Quote Originally Posted by Athiril View Post
For good results of a positive, I've found the first dev needs to be hot ~39c like normal, otherwise even with a good b&w neg developed, the positives tend to have an extremely dense base/fog to them on top of the image.
Good info. I have no problem with using the normal 100f or better and I have plenty of Xtol, just need to work out the right times.

Did you per chance start at 3'15" with that hot Xtol?

Quote Originally Posted by Athiril View Post
For that particular image I think I just used E-6 colour developer, I've used CD-4 on others (C-41), results on E-6 film should be more or less the same, I've developed colour slides using Xtol as the first dev (40c), with C-41 as the colour developer, and the colours were fairly accurate then too.
I've got the C-41 developer so I'll be starting there. Life will be simpler if I can avoid E-6 specific chems.

Quote Originally Posted by Athiril View Post
works like this:
B&W first dev to make silver neg.
Fix to remove remaining silver halide, leaves only b&w neg.
Bleach to convert developed silver back to silver halides, which just leaves a negative image 'mask' of undeveloped silver halide.
Exposure of silver halide to light to make it easily developable.
Colour Developer to re-develop the negative image and form a colour negative.
Bleach to convert again silver back to silver halide
Fix to remove silver halide to leave no image apart from the colour dye.

You can skip the last 2 steps for a bleach-bypass effect.
I assume that normal times for the ancillary processes are sufficient, is that correct?