Definition Edit

Secret writing is a

technique employing invisible messages hidden in or on innocuous materials. This includes invisible inks and microdots, among many other variations.[1]

Overview Edit

"The simplest secret writing uses organic inks: milk, vinegar, lemon juice, even urine. These inks dry invisibly and can be developed by applying heat. Espionage agencies have produced many inks made of chemicals that could be developed only by a specific chemical."[2]

References Edit

  1. Office of Counterintelligence (DXC), Defense CI & HUMINT Center, Defense Intelligence Agency, "Terms and Definitions of Interest for DoD Counterintelligence Professional," at GL-152 (May 2, 2011) (full-text).
  2. Id.

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