an American physician and politician. He was brother of John Jay, one of the Founding Fathers of the United States. While initially a supporter of American independence, he later changed his views becoming a Loyalist and went into exile in London after the Treaty of Paris recognised independence. Invisible ink was used occasionally after Sir James Jay invented two special fluids, and sent a supply to his brother John Jay in New York. Sir James would use the ink at the bottom of brief, friendly letters to his brother and even send the letters unsealed, so that British authorities might inspect the contents.
