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.… read more