Easy Science Experiment For Kids: Send secret messages

In this experiment, we will make our own invisible ink that no one can read if you don’t know the secret trick! Let your kids write a secret message, their Christmas present wish list, or just let them draw something on paper. Make sure that they use enough lemon on their message, otherwise, it will be lost.

Remember to start the experiment with a hypothesis, what do you think will happen?

Read this first.

Material included:

  • A toothpick or tops
  • Plain white paper
  • Lemon

Additional things you will need:

  • An oven, hairdryer, or iron


  1. Divide the lemon in the middle and squeeze the juice into a bowl.
  2. Dip the toothpick or tops into lemon juice and write your message on the paper.
  3. Allow the paper to dry properly before sending it to the person you want to read the message.
  4. You induce the message by “baking” the paper in the oven.
  5. Set the oven to 300 degrees F (150 degrees C).
  6. Put the paper in the oven for about 10 minutes.
  7. Remove the paper from the oven. Now you should be able to read the message!


You can also make invisible ink with other ingredients like milk.

Instead of “baking” the paper in the oven, you can iron the paper.


To see others do the experiment look at this video:

Click the link to get to my Kids Christmas Calendar for more experiments.

Do you have any questions or comments about the experiment? Just leave a comment below!



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