This clever technique can hide secret messages in plain text - Worldkings

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WORLDKINGS - Daily Highlighs - April 19, 2018 - This Clever Technique Can Hide Secret Messages In Plain Text

18-04-2018

(Worldkings.org) Using invisible ink to hide messages is a technique which was used several years ago. During the World War, spies used acidic liquids like lime juice to create a pattern on paper which was visible only when exposed to heat.