Print carefully, don't press too hard, and you'll be okay.
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.
horse hooves and bone.
Name your glue - there are thousands of types with many different melting points .!
Most envelopes are pre-glued with 'gum arabic'
Envelopes have a strange taste when you lick the seal because there is a layer of glue there. The glue is made from gum arabic. Gum arabic is produced with the sap of acacia trees.
yes it's a physical change
The taste is not harmful, but it does mean you have a good sense of taste.
At least since the 1400's and probably much earlier.
If the melting point of the glue is lower than the melting point of the bag, it's not.
They like the glue on envelopes. Do not lick the glue!
No, if you are referring to the ones you lick, they use a Casein-based glue.