Ancient hair dye used nanotechnology





2000-year-old recipe for hair dye shows Ancient Greeks and Romans used nanotechnology to permanently colour grey hair black, say experts.

Dr Philippe Walter of the French state museum agency's Centre for Research and Restoration and colleagues report their findings online in the journal Nano Letters.

The researchers made up a batch of dye according to a recipe used since Greco-Roman times, which includes a mixture of lead oxide and slaked lime....



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