Date: Fall 2011
What are considered to be among the earliest adhesives?
My thought is that the first humans, or even before they became human
learned that blood was sticky.
Also sap from trees, especially from pine trees, are sticky. Then they
specialized from there.
The earliest adhesives were made from naturally sticky substances
such as tar, and some types of tree sap. Glues made from processed
animal hoofs and fish byproducts were also among the earliest
adhesives. If you Google "early adhesives" you will find quite a bit of
interesting information on this subject.
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Update: June 2012