An infrared light that makes a stamp on a the hand visible

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    hand Infrared Light
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SUMMARY

The discussion centers on an identification system utilizing an invisible ink stamp on the hand that becomes visible under infrared light. Infrared radiation, a form of heat radiation, allows the detection of this stamp without increasing the hand's temperature. The conversation clarifies that the visibility of the stamp is due to infrared light, not ultraviolet light, which is often confused with it. This technology has been in use for over 40 years, demonstrating its longevity and effectiveness in identification systems.

PREREQUISITES
  • Understanding of infrared radiation and its properties
  • Knowledge of identification systems using invisible inks
  • Familiarity with the differences between infrared and ultraviolet light
  • Basic principles of how infrared cameras function
NEXT STEPS
  • Research the types of invisible inks used in identification systems
  • Explore the technology behind infrared cameras and their applications
  • Learn about the historical development of invisible ink technologies
  • Investigate the safety and efficacy of infrared light in various applications
USEFUL FOR

This discussion is beneficial for security professionals, researchers in identification technology, and anyone interested in the applications of infrared and ultraviolet light in practical scenarios.

partialfracti
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I read about a type of identification system in which a person's hand is stamped with some sort of ink or substance that is invisible to the naked eye. This normally invisible stamp on the human hand is visible under an infrared light. I remember that an infrared camera sees things that give off heat. Apparently infrared radiation is heat radiation.

I don't think the stamp makes the hand hotter. How would the invisible stamp on the human hand be made visible by infrared light?
 
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Are you certain that is is not ultraviolet light? Such stamps/scanners have been around for at least 40 years.
 
Perhaps what I read about is ultraviolet light.
 

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