Polyglot. All I can say is DUH!. That's what I get for answering when I need a nap. I just pulled the roll of backing out of the trash and there is indeed a pattern that faintly shows over the entire white outer surface. So now the questions is, what creates this pattern? Could it be some sort of out-gassing from the paper, or a raised printing artifact from the paper manufacturing process that literally embosses on the film? A chemical reaction between the inks in the white outer coating? Any ideas?
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