I've heard all the warnings, but have never had a problem. I will continue to flirt with disaster only because I love the way TMX and TMY look in this stuff. As far as the oxidation problem goes, I've had a batch of Xtol stored in a half full 1 gallon plastic jug for a period of three months and used it with no problem. The package says it's shelf life is about a year. I wouldn't dare keep it around this long, but it shouldn't be oxidizing after only a few weeks. I always mix the stock and working solutions with distilled water. This may solve some of the problems that people are having with it.(posted 8587 days ago)