- Vinegar or Lemon Juice
- Feather or thin paint brush
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.