1From John Jay to Peter Augustus Jay, 30 March 1813 (Jay Papers)
...“when he first sent me some of his invisible Ink?” tell him that I cannot recollect the...
2To James Madison from James Jay, 1 July 1811 (Madison Papers)
...the use by the Continental Congress of an invisible ink he had invented. As secretary of...
3Thomas Jefferson to James Jay, 7 April 1809 (Jefferson Papers)
...American Revolution he used an invisible ink of his own invention to pass on intelligence...