Childhood colours...

Party balloons are mostly made of natural latex tapped from rubber trees and can be filled with air, helium, water, or any other suitable liquid or gas. The rubber allows for elasticity which makes the volume adjustable. Most of this rubber is made from recycled material, such as old tires and tennis shoes.
Filling with air is done with the mouth, with a manual or electric inflator (such as a hand pump) or a source of compressed air. More >>