I hope kjsphoto's troubles are cured. I installed a non-glare glass in his frame and, at least on my workbench, the Newton's rings were much less apparent. I'd like to write a little article for my web site on this topic, but I admit I have only this minimum personal experience to go on. Maybe I just never noticed, because now that I'm tuned in to it, I see the pesky little patterns on every frame and negative I take the time to closely inspect. I'd like to hear from anyone who has had trouble printing due to Newton's rings. Where, in the print, are the effects most noticeable? (highlights, midtones, shadows). Are certain films less apt to produce the effect? I wouldn't expect the chemistry to have any bearing since it's the film base side adjacent to the glass, but you never know. What remedies have shown the best results?