Quote Originally Posted by bowie View Post
What is your APX 400 base colour? My APX 400 base is grey. The negative looks dark, though when I look against the light everything is OK. My APX 100 is base is transparent clear, expiry date 2006 and younger
I used to get that base color too when I used the film. At first I thought it was insufficient fixing, but fresh fixer and several rolls later confirmed that the sort of milky base was a quality of the film.

I did get a couple of rolls back from a lab once, and they were absolutely clear, which baffled me. I asked them what they used, and it was a seasoned tank of Xtol, Kodak fix, and a second fixer of plain hypo.
I was never able to replicate their results, but it doesn't really matter since you just print right through the base anyway.