Is there a quick clip test that I can do to make sure my Xtol hasn't gone dead before I use it? To be honest, I have been skeptical that Xtol even goes bad in the sense that people have described it, so I intentionally kept an almost empty bottle of the stock for over a year until it turned the color of beer. You'll never guess what came out on the test film I developed in it. Nothing. Completely clear. No frame numbers, even. Unfortunately, I threw the remainder of it away, so I am not able to experiment to find out of there is any quick way of identifying it's demise short pf developing a test film in it. Today I put some out in an uncovered dish to see if I could accelerate the failure mode and experiment a bit, but I'd be interested in hearing from anyone who might have already developed a quick test. I assume that the developer does not lose all it's potency at once, but I can tolerate thin negatives a lot better than clear negatives.