I found a box of Victorian era paste, wafer seals! They were made of flour, water and pigments, dried into discs, and used to seal letters before the ultra-modern invention of gummed envelopes. You'd wet them and press them between the flaps of your letters. Often a waffle-pattern seal was used to press them together.
Anybody have more information?
Antique wafer seals by JBBJBB, on Flickr
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