Ultimate Hair Dye! Chemical-Free and Permanent! A bit expensive…

acs gold nanoparticle hairs

Little upset with gray hairs? Or maybe you’re one of those young people with persisting gray spots. If you like to live on the cutting edge, French scientists may have something for you.

Shrutisagar et al. from Institut de Chimie Moléculaire et des Matériaux d’Orsay recently published findings in Nano Letters that might offer a radical hair dye solution. They submerged white hairs into some fluorescent gold nanoparticles in solution. Hairs spontaneously turned yellow within a day. After 15 more, hairs develop a dark brown hue. Researchers note the color persists despite repeated washes.

The synthesis and detailed characterization of gold nanoparticles (AuNPs) inside human hair has been achieved by treatment of hair with HAuCl4 in alkaline medium. The AuNPs, which show a strong red fluorescence under blue light, are generated inside the fiber and are arranged in the cortex in a remarkably regular pattern of whorls based on concentric circles, like a fingerprint. It opens an area of genuine nanocomposites with novel properties due to AuNPs inside the hair shaft. (Credit: American Chemical Society)

gold nanoparticles hair

Images from American Chemical Society

The result: deep, dark brown hair dye that doesn’t wash out. The hair fibers also fluoresce red under blue light!

Granted, not everyone can afford to synthesize gold nanoparticles and treat their hair. Gold’s pretty expensive as it is (and has been increasing over the past 10 years!).

gold prices 10 years

Source 1 via, 2


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1 Response

  1. Ellis Slomba says:

    Oxidizing agents are usually hydrogen peroxide, and the alkaline environment is usually provided by ammonia. The combination of hydrogen peroxide and the primary intermediate causes the natural hair to be lightened, providing a “blank canvas” for the dye. Ammonia opens the hair shaft pores so that the dye can actually bond with the hair and speeds up the reaction of the dye with the hair….


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