TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Using hair straighteners. Thermogram of a woman using electrically heated tongs to apply heat to straighten her hair. Thermography records surface temperatures by detecting the long-wavelength radiation emitted by an object. Here, the colour-coded temperature scale runs from white (warmest) through yellow, red and purple to black (coldest).
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