Detective Activities for Kids


Secret Message-Making Activity

Try this secret message-making activity and write an invisible message -- then amaze your friends by making it appear out of nowhere! This activity is ideal for children who enjoy easy crafts.

What You'll Need:

  • Lemon juice
  • Grapefruit juice
  • Milk or baking powder
  • Paper
  • Paintbrush or cotton swab
  • Scrap paper
  • Iron

Invisible messages can be written using several different kinds of substances. You can experiment with different "secret inks." Try writing messages with lemon juice, grapefruit juice, milk or baking powder.

Write your message on a piece of paper using a paintbrush or a cotton swab. Write carefully because you won't be able to see the message while you're writing it!

To make the message appear, have an adult help you place the message paper between two sheets of scrap paper on an ironing board and then iron the papers with a warm iron.

Your message will appear as if by magic -- but it is really a chemical reaction that happens quickly because of the heat of the iron.

Continue reading to learn more about our periscope activity on the next page.

For more fun activities and crafts, try: