How to lose 50 years of aging in 16 days
January 3, 2013
Attention seniors: French scientists have developed a process that permanently dyes white hair without harmful chemicals.
Philippe Walter and colleagues soaked white hairs in a solution containing fluorescent gold nanoparticles.
The hairs turned pale yellow and then darkened to a deep brown. The color remained even after repeated washings.
Using an electron microscope, the scientists confirmed that the particles were forming inside the hairs’ central core cortex.
The discovery has applications ranging from hair dyeing to electronic sensors to development of materials with improved properties, the scientists said.