Print carefully, don't press too hard, and you'll be okay.
Yes, a glue gun melting glue is an example of a physical change because the glue changes from a solid to a liquid without undergoing any chemical reaction.
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'
Name your glue - there are thousands of types with many different melting points .!
It is generally safe to use glue on styrofoam as long as the glue is labeled as safe for use on styrofoam. Using the wrong type of glue can cause damage to the styrofoam by melting or dissolving it.
At least since the 1400's and probably much earlier.
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.
If the melting point of the glue is lower than the melting point of the bag, it's not.
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.
no