Hi, the problem would be that the afterglow is mostly in invisible or hardly visible spectrum radiation, to which film and paper is most sensitive, but you don't see it. I would be extremely warry when loading film into tank, and I would do some tests with paper, or at least wait 5 secs before doing something with paper, and wait perhaps thrice that with film, to be on the safe side. Again, the problem is that it's most likely on the invisible side of spectrum.
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