Originally Posted by
Harold_4074
It sounds like your question really is one of distinguishing leather from some synthetic.
If you remove one of the frames, you may get access to a free edge from which you can very carefully trim a sliver. Drop it into an old spoon that has been heated to 400 F or so and the smell should give you then answer. (Also, practically any of the non-leather candidates would be a thermoplastic, so if it melts, it isn't leather.)
There are a few other simple tests that would allow you to narrow down the range of polymers, if you really care, but I'm not sure just how useful that would be in the absence of a good knowledge of polymer chemistry and the exact formulations of the many candidate cleaners.
I have the impression that many of the early cameras with red bellows used goatskin; I have a Kodak 2D with nearly pristine red bellows, and it really looks like some kind of leather, anyway.
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