At least since the 1400's and probably much earlier.
glue it is a type of glue activated by liquid (your spit)
Wax is NOT a good substance for glue, it can seal things such as envelopes, but will not actually glue anything.
Most envelopes are pre-glued with 'gum arabic'
The taste is not harmful, but it does mean you have a good sense of taste.
No, if you are referring to the ones you lick, they use a Casein-based glue.
With self-sealing envelopes, all one have to do is to remove the protective tape from the flap and close the flap down for a secure seal. It differs from other envelopes in that it doesn't require glue to seal the envelope so it is more convenient.
Print carefully, don't press too hard, and you'll be okay.
Take the rollers out and wipe them with a rag containing Goof Off.
She died in the series by licking cheap glue on the wedding announcement. envelopes.
Glue stick.
The glue on the back of envelopes is typically made from a mixture of water, adhesive (like gum arabic or synthetic resin), and a preservative to prevent microbial growth. This mixture creates a sticky substance that is activated by moisture and allows the envelope to be sealed shut when licked or moistened.
PUT SOME GLUE ON IT PUT SOME GLUE ON IT