13—Spy Letters
Where were these spy letters delivered and why only those places? Design your own code and create a mock spy letter from one spy to another as it may have been written during the American Revolution. If you were a spy during the American Revolution, where would you hide a message? Try this recipe for invisible ink:4 drops of onion juice, 4 drips of lemon juice, pinch of sugar. Stir together the onion juice, lemon juice, and sugar in a shallow bowl. Use a toothpick to write your message. As the "ink" dries you message will disappear. Hold the message over a bright bulb and your message will magically reappear.

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