I once had some kind of white stuff floating in my Xtol at a time when I was still storing it in brown glass bottles and I found out that the developer wasn't working properly anymore. I have no proof that this failure was related to the white stuff, the batch was a couple of months (3-4?) old at that time, it might have been coincidence, still ... After that I started using 5 liter wine bladders to store Xtol and haven't had a single problem since. Xtol holds up to 8 months that way and maybe even longer, I just never tested it. The wine bladder is very practical and the best thing is, you will never again have to worry about any precipitate, because even if was there you would never see it!
Originally Posted by presspass
Well ... I suggest you don't take any risks and run a test roll with the developer to see if it's still good.