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Hello folks, Currently I'm surveying the condition of a collection of reel tapes that are almost entirely backed with cellulose acetate. Usually it's obvious, because the acetate tapes practically glow when held up to the light. But occasionally I'm finding a tape that is just barely translucent - if I move my finger behind the tape pack, I can see a shadow, but I have to look hard. Is there another formulation for acetate tape that isn't nearly as translucent? Because the others are so obvious, I would have marked this kind down as polyester or PVC, except that one of them seemed to have a slight vinegar odor. Thanks, Rick Taylor Graduate Student Preservation and Conservation Studies School of Information University of Texas at Austin [log in to unmask]