An animal glue is an adhesive that is created by prolonged boiling of animal connective tissue.
These protein colloid glues are formed through hydrolysis of the collagen from skins, bones, tendons, and other tissues, similar to gelatin. The word "collagen" itself derives from Greek κόλλα kolla, glue. These proteins form a molecular bond with the glued object.
Stereotypically, the animal in question is a horse, and horses that are put down are often said to have been "sent to the glue factory." However, other animals are also used, including rabbits and fish.
Read more about Animal Glue: Types and Uses
Famous quotes containing the words animal and/or glue:
“‘Tis said that courage is common, but the immense esteem in which it is held proves it to be rare. Animal resistance, the instinct of the male animal when cornered, is no doubt common; but the pure article, courage with eyes, courage with conduct, self-possession at the cannon’s mouth, cheerfulness in lonely adherence to the right, is the endowment of elevated characters.”
—Ralph Waldo Emerson (1803–1882)
“I was never one to patiently pick up broken fragments and glue them together again and tell myself that the mended whole was as good as new. What is broken is broken—and I’d rather remember it as it was at its best than mend it and see the broken places as long as I lived.... I wish I could care what you do or where you go, but I can’t. My dear, I don’t give a damn.”
—Margaret Mitchell (1900–1949)