In this study, black tattoo inks, which have a long history of use by humans, are shown to be suitable reference materials composed of nano-sized carbon black particles. We have also demonstrated that multi-walled carbon nanotubes have comparable basic safety properties to those of tattoo inks when used as biomaterials.
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Materials Today (2011) 14(9), 434-440
doi: 10.1016/S1369-7021(11)70188-2