A type of ink used to produce writing that cannot be seen until the paper is heated or otherwise treated.
- Visitors to the open day were able to try their hand at a series of techniques such as passport forgery, code-breaking and writing in invisible ink.
- Peggy wrote in invisible ink, literally between the lines of innocent letters, she wrote the troop movements, the intelligence that the British were paying for.
- Ben is quick to deduce that the map to the treasure is inscribed in invisible ink of the back of the American Declaration of Independence.
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