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How to Make Invisible Ink
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When exposed to heat, the weakened spots burn before the rest of the paper,
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Hi, Im Jason Phipps for About.com, and today Im going demonstrate how to make invisible ink. Use the juice as ink by applying it to a stick or paintbrush and writing on paper. Allow the paper to dry, and the message will disappear. If you write a cover message, use a ballpoint pen or pencil. When you are ready to read your invisible message, hold the paper up to sunlight, or hold the paper up to a lightbulb, or, if you choose, iron it.Be careful not to overdo your heating and ignite the paper! The ink will turn brown, revealing your message! So how does this work? The Acid in the ink weakens the paper fibers.  When exposed to heat, the weakened spots burn before the rest of the paper, revealing the hidden message. Thanks for watching, this has been Jason Phipps for About.com. To learn more, please visit us on the web at education.about.com.
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