MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Kirlian photograph of human fingerprints. The Kirlian technique, also known as electrophotography, high-voltage photography, radiation field photography or corona discharge, obtains a photographic image due to interactions between the subject & an applied electric field. No external light source is used; light emitted as photons from the electrical interaction causes the image on film. A controversial medical application of the technique involves correlating the physical & mental well-being of a subject with image variation arising from differences in sweat rate & sweat composition on the skin surface.
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