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 sugarStir 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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