Write it: Write your message with a white crayon. When you heat the paper, the acidic message burns or turns brown before the rest of the paper. The acid also stays on the paper after the invisible ink has dried. ![]() How it works: All of the liquids are mild acids that weaken the paper wherever you write your message. Read it: Heat the paper using a hair dryer, hot iron, holding it near a light bulb or warming it in the oven at 300 oF for 10 minutes. Write it: Use a cotton swab or toothpick to write your message with vinegar, milk, lemon juice – or really any fruit juice will work. Graphite sticks to the fat more than the paper to reveal the message. How it works: When your message dries on the paper, most of the milk evaporates but the fat stays on the paper. Gently rub the graphite over the paper until your message appears. Read it: Rub the graphite (black part) of a sharpened pencil on some sand paper over the message so that a graphite powder falls onto the paper. Write it: Use a cotton swab or toothpick to write your message with whole (must be whole or at least 2% – won’t work with skim) milk. All of these can be written on ordinary white paper. While I can’t tell you how to send a message via hard-boiled egg, I do have several simple, foolproof recipes for invisible ink. How crazy is that? Imagine peeling your egg for breakfast and finding a secret message! The message seeps through the shell and can only be read by peeling the egg. ![]() Giovanni wrote messages on the shell of a boiled egg using a mixture of alum and plant pigments. In fact Giovanni Battista Della Porta, an Italian guy who lived about 500 years ago invented what I believe is the most creative way to send a secret message. Who doesn’t like to send secret messages?
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