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Given the normal process for making glue I wouldn't be so certain.


Most modern glues are synthetic. Super glue is usually cyanoacrylate, regular glue sticks might be Polyvinyl Acetate (PVA). Outside of specialty glues that are intentionally going for old school methods, it's not really a thing anymore


IIRC, envelopes still use adhesives derived from gelatin. Maybe stamps have modernized at some point?


There’s also PVA used there


How recently were stamps with glue invented?


https://en.wikipedia.org/wiki/Postage_stamp_gum

Apparently 1837, and the original adhesive was made from potato starch and gum arabic.




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