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During the American Revolution, invisible ink was an important method of communication for spies on both sides.
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Revealing Washington's request for invisible ink
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George Washington Papers, Series 4, General Correspondence: Bezaleel Kerr to Aneas Urquhart, May 22, 1779, [Reverse orientation text written in invisible ink between lines of fake letter]
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純正人気 Invisible ink MAD size S
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George washington tomb hi-res stock photography and images - Alamy
Spies at Mount Vernon (The Virginia Mysteries): Smith, Steven K
Spies at Mount Vernon: The Virginia Mysteries, Volume 7 (Audible Audio Edition): Steven K. Smith, Tom McElroy, MyBoys3 Press: Books
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