|
Glue dates back to prehistoric times. Artists once mixed colorings with raw eggs, dried blood, and plant juices to make sticky paints for cave murals. Later, ancient Egyptians and other people learned to make stronger glues by boiling animal bones and hides. Today companies make glues using synthetic substances.
|
Illustration by Dave Whamond
|
©1996 National Geographic Society. All rights reserved. |
|
