By A Mystery Man Writer
During the American Revolution, invisible ink was an important method of communication for spies on both sides.
George Washington's Mt Vernon
Memphis Inno - This International Paper offering uses conductive
George Washington's Mt Vernon
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How to Make Invisible Ink · George Washington's Mount Vernon
How to Make Invisible Ink · George Washington's Mount Vernon
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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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