How to Make Invisible Ink

Write a secret message with invisible ink using these simple household items.

Instructions

  • Step 1: Put lemon juice in bowl Put the lemon juice in a bowl and dip your cotton swab in the lemon juice.
  • TIP: Using milk, vinegar, or orange juice instead of lemon juice will have the same effect.
  • Step 2: Write your message Write your secret message on the paper with your cotton swab and let the writing dry completely. The message will be invisible when the message dries.
  • TIP: You can use a paintbrush or a toothpick instead of a cotton swab.
  • Step 3: Heat the paper Hold the paper near the light bulb to expose it to the heat, but don’t rest the paper on the bulb.
  • Step 4: Message appears Watch in amazement as the message magically appears. The words will appear in a tan or brown color.
  • FACT: Did you know? Arizona and California produce 95 percent of the U.S. lemon crop.

You Will Need

  • Lemon juice
  • A bowl
  • A cotton swab
  • White paper
  • A light source with a 100-watt light bulb
  • Milk (optional)
  • Vinegar (optional)
  • Orange juice (optional)
  • Paintbrush (optional)
  • Toothpick (optional)

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