infrared luminescence

infrared luminescence
   A phenomenon encountered with some dyes used in inks and colored pencils that, when illuminated with a narrow band of light in the blue-green portion of the spectrum, give off a luminescence that can be detected in the far-red or near-infrared range. The technique is useful in distinguishing between certain inks and colored pencils, and in detecting or deciphering erasures.

Forensic science glossary. . 2012.

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