Ancient Hair-Dyeing – A Nanoscience?

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An elecron microscopy images of the cross section of a dyed strand of hair showing portions of the cortex and cuticle. Dark spots are lead accumulations.
An elecron microscopy images of the cross section of a dyed strand of hair, showing portions of the cortex and cuticle. Dark spots are lead accumulations.

Scientists have discovered that an ancient method used to darken hair, dating back more than 4,000 years, is based on a chemical process that takes place at the nanoscale. This may be one of the earliest examples of nanoscience at work in a practical application.


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