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Invisible Ink


  • Vinegar or Lemon Juice
  • Feather or thin paint brush
  • Paper
  • Candle
    Warning: Adult Supervision Advised


  • Dip brush in vinegar or lemon juice and write note on paper
  • Let Dry
  • To Read the Message:
    • Pass paper back and forth, near the ball of the candle flame
    • the message will gradually appear
    • Warning: be careful not to get too close to the flame


Why does the ink turn dark?

There is chemical reaction.

The ink chars at a lower temperature than the paper does.