When paper dries and is subsequently rewetted, its properties change permanently. This phenomenon is known as hornification. New research now shows that the process is more complex than previously assumed, and that temperature, humidity, and fiber type all play decisive roles. During hornification, fibers in paper products lose some of their ability to absorb water. This has major implications for everything from paper manufacturing to recycling, where controlling the material's strength and durability is crucial. ...read more read less