Photo 3 (IMAGE)
Caption
(a) Through a simple heating process, the chemical nature of human hair changes and this enhances its fluorescence capability, allowing the formation of patterns. (b) Micro- and macroscopic messages can be hidden in plain sight using materials made from these human hairs. (c) The words “NUS” are made from human hairs with heat treatment. (d) From right to left: Visuals showing a strand of heat-treated white hair immersed in decreasing concentrations of methylene blue. Heat treatment of white human hair increases its chemical detection capabilities. When in contact with methylene blue pollutants, it glows brightly under ultraviolet light.
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National University of Singapore
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