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Old-written material, which cannot be read easily can be read by?

  • A.Infra red rays
  • B.Cosmic rays
  • C.Ultraviolet rays
  • D.None of these

Answer: A

Faded old writing can be read under infrared light. Different inks and the paper beneath them absorb and reflect infrared differently, so the writing shows up in an infrared photograph even where it is invisible to the eye.

The technique is standard in manuscript study and in forensic document examination.

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