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By Andrew Maynard

Graphene is something of a celebrity in the world of nanoscale materials. Isolated in 2004 by Nobel Prize winners Andre Geim and Konstantin Novoselov, these ultrathin sheets of carbon atoms are already finding novel uses in areas like electronics, high-efficiency heating systems, water purification technologies and even golf balls. According to recent research published in the journal Chem, hair dyes can now be added to this list.

But how safe and responsible is this new use of the carbon-based wonder-material?

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