Hidden Messages with Highlighter (Invisible Ink Trick)

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Materials:

  • Lemon juice
  • Yellow highlighter
  • White paper
  • UV light (optional)

How to do it:

  1. Write your message with lemon juice (use a cotton swab).
  2. Let it dry completely.
  3. Run the yellow highlighter over the paper → message appears!

Why it works: Lemon acid weakens paper fibers; highlighter makes them glow.