DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Image of a child's feet produced on thermochromic film. Thermochromic materials use liquid crystal technology which is encapsulated in the film, and at specific temperatures the liquid crystals re-orientate to produce a change of colour. The image shows warmer areas coloured yellow, changing to green and red, and blue the coolest.
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