Idée Couleur & Coiffure Femme 2017/ 2018 :
Description
« Permanent Hair Color »: French scientists have developed a process that permanently dyes gray hair without harmful chemicals. By soaking the faded hair in a solution containing fluorescent gold nanoparticles, the strands first turned a pale yellow and then darkened to a deep brown. The color remained even after repeated washings. | Philippe Walter and colleagues
