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Steganography
Key terms: ink light paper pen heat developed invisible ink messages turns ultraviolet iodine sodium mail fumes fluids chemical letters solution soap lamp fluoresce agents screening obtain depend lemon substances tinta ammonia vinegar uv light made visible ink may sulfate nitrate chloride world war potassium under ultraviolet light ink should disappearing inks phenolphthalein sodium carbonate red cabbage water developed by heat chemical reaction may be made visible ideal invisible ink commercially available visible under ultraviolet light Search external links cited by footnotes on Wikipedia page Invisible ink: |
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